Open any serious book catalog — a dealer's list, an auction lot description, a library record — and you will encounter punctuation that looks like it was designed to confuse civilians. Square brackets. Question marks in the middle of dates. Latin abbreviations that no one pronounces correctly. Superscript numbers floating above letters of the alphabet. A system of notation so dense that a single line like [4], xvi, 342 p., [16] leaves of plates : ill. ; 23 cm can describe a physical object with more precision than most people manage in a full paragraph.
This is not decorative. Every bracket, every abbreviation, every carefully placed question mark carries specific meaning — meaning that, once learned, makes the difference between reading a catalog entry and actually understanding what you're looking at. It also makes the difference between cataloging a book competently and cataloging it in a way that makes experienced dealers wince.
Here is what all of it means, and when to use it yourself.
Square Brackets: The Confession
The square bracket is the most important symbol in bibliographic notation. It means one thing: this information does not appear on the book itself. The cataloger has supplied it from external evidence, personal knowledge, reference works, or educated guesswork. The brackets are an act of honesty — a declaration that says "I'm telling you this, but the book didn't tell me."
Supplied place of publication. The title page of your 1798 chapbook names no city. You know from the printer's address, found in a contemporary directory, that it was printed in Edinburgh. You write: [Edinburgh]. Without brackets, a reader assumes Edinburgh is printed in the book. With brackets, they know you figured it out. The brackets are the difference between transcription and scholarship.
Supplied date. The book has no printed date. You've established from a contemporary review that it appeared in 1847. You write: [1847]. If you're less certain — perhaps the watermark suggests a date range — you have more expressive options, which we'll get to shortly.
Supplied publisher. The title page reads "Printed for the Author" — technically a publisher statement, but not a useful one. If you've identified the actual printer from the colophon or a reference bibliography, you might add: [printed by William Bulmer].
Unnumbered pages. This is where brackets appear most frequently in practice. The preliminary pages of your book — half-title, title page, dedication, preface — aren't numbered. You count them yourself and write: [8], 246 p. Those brackets around the 8 tell any reader that the book doesn't number those pages. You did the counting. If you got it wrong, that's on you, not the book.
The principle is consistent and absolute: if the book says it, you transcribe it without brackets. If you say it, you put it in brackets. A book that prints "London" on its title page gets London in the catalog entry. A book that prints nothing, but which you know was published in London, gets [London]. The brackets are the border between the book's testimony and yours.
The Question Mark: Degrees of Doubt
Not all uncertainty is equal, and bibliographic notation has a surprisingly nuanced vocabulary for expressing exactly how unsure you are.
[1847] — You're confident. The date doesn't appear in the book, but you've established it from reliable external evidence. A bibliography, a contemporary review, a publisher's archive. The brackets say "supplied"; the absence of a question mark says "but I'm sure."
[1847?] — You're fairly confident but not certain. Perhaps the evidence is circumstantial. Perhaps two bibliographies disagree. The question mark is not a shrug — it's a calibrated expression of probability. You think it's 1847. You could be wrong.
[ca. 1850] — You don't know the exact year, but you can estimate. The ca. (circa) places the date in the neighbourhood of 1850. How large that neighbourhood is depends on context: for a nineteenth-century book, ca. 1850 might mean 1845–1855. For an incunabulum, ca. 1480 might span a decade or more. Shelvd accepts both ca. and c. — the trade uses both, often inconsistently, sometimes in the same catalog.
A note on standards: AACR2, the cataloging rules that governed library practice for decades, used ca. for approximate dates. RDA, the newer standard that replaced it, prefers a question mark: [1850?] instead of [ca. 1850]. In library cataloging, the question mark is now standard. In the antiquarian trade, ca. and c. remain universal. Shelvd generates both formats depending on whether you're producing a Trade or ISBD catalog entry — because your auction house and your librarian live in different centuries, and we respect both.
[between 1918 and 1923] — You can narrow it to a range. Perhaps the publisher operated only during those years, or the paper stock matches a known production period.
[not before 1840] — You have a terminus post quem. The book references an event from 1840, so it can't predate that year. When it was actually published is anyone's guess.
[not after 1860] — You have a terminus ante quem. Perhaps a contemporary binding or an owner's dated inscription establishes that the book existed by 1860.
n.d. — No date. The nuclear option. You have no idea when the book was published, and you've exhausted your avenues of investigation. Writing n.d. is an admission of defeat, but an honest one. It is vastly preferable to inventing a date, which is an admission of something worse.
In Shelvd's Publication Year field, all of these are valid entries. The catalog entry generator knows the difference and formats accordingly.
The Latin: Dead Language, Living Practice
Bibliographic cataloging preserves a handful of Latin abbreviations that have survived every attempt to replace them with plain English. RDA officially retired them in favour of phrases like [publisher not identified] — nine syllables where two letters used to suffice — but the antiquarian trade, which was using these terms before RDA's grandparents were born, continues to use them without apology.
[s.n.] — sine nomine, without a name. No publisher is identified in the book. This appears in the Publication area of an ISBD entry: [S.l.] : [s.n.], 1784. Translation: we don't know where it was published, we don't know who published it, but we know it happened in 1784. A sentence of remarkable precision about the limits of our knowledge.
[S.l.] — sine loco, without a place. No place of publication is identified. Note the capital S — it's conventional, distinguishing place from name. In Shelvd, if you leave the Publication Place field empty, the ISBD catalog entry automatically inserts [S.l.]. You don't need to type it yourself. We assumed you'd rather not.
n.d. — no date, already discussed above. Sometimes written s.d. (sine dato) or s.a. (sine anno) in Continental catalogs, particularly French and German ones. All three mean the same thing: the date is unknown. The proliferation of abbreviations for "we don't know" is itself a small monument to the history of not knowing.
ca. — circa, approximately. Discussed above. Appears before dates and occasionally before measurements in older catalog entries.
et al. — et alii, and others. Used when a book has more authors than you care to list. Modern practice gives the first-named author followed by [et al.] — the brackets indicating, as always, that the book doesn't actually print those words on its title page.
fl. — floruit, flourished. Used when an author's birth and death dates are unknown but their period of activity can be estimated. "Johannes de Spira (fl. 1469–1470)" tells you that we know nothing about this man's life except that he was printing books in Venice during those two years. It is biography reduced to its most essential facts.
i.e. — id est, that is. Used to correct errors without altering the transcription. If a title page reads 1529 but the book was actually published in 1539, you write: MDCCCXXIX [i.e. 1539]. The original error is preserved — because we transcribe what the book says — and the correction follows in brackets. RDA replaces i.e. with the English phrase that is, which is clearer and less elegant, a trade-off that characterises most RDA decisions.
[sic] — sic erat scriptum, thus it was written. Used after an error in transcription to confirm that yes, that's really what it says. If the title page reads "The Wolrd of Art," you transcribe The Wolrd [sic] of Art. The [sic] protects you from the suspicion that you can't spell. RDA dropped [sic] entirely — under RDA, you transcribe the error silently and record the correct form as a variant title. The trade still uses [sic] freely, because sometimes you want the reader to know that you noticed.
Pagination: Every Page Accounted For
The pagination statement is where bibliographic notation reaches its highest density, and where beginners most often lose their nerve. It is also where the notation is most useful, because a properly written pagination tells you exactly what a complete copy should contain — which is the first question any collector should ask.
The basic structure: preliminary pages in lowercase Roman numerals, text pages in Arabic numerals, unnumbered pages in square brackets, plates counted separately.
xvi, 342 p. — Sixteen preliminary pages (numbered i–xvi in the book), followed by 342 pages of text. Simple.
[4], xvi, 342 p. — Four unnumbered pages before the numbered preliminaries begin. Typically: half-title (recto), blank (verso), title page (recto), blank or dedication (verso). The brackets tell you the book doesn't number them. You counted.
[4], xvi, 342, [2] p. — Same as above, plus two unnumbered pages at the end — often a colophon and a blank, or advertisements.
xvi, 248 p., [16] leaves of plates — Here the distinction between p. and leaves matters. A page is one side of a leaf (recto or verso). A leaf is the whole physical sheet. Sixteen leaves of plates means sixteen sheets, each potentially printed on both sides (giving up to 32 images). If the catalog says 16 p. of plates, that's sixteen page-sides — only half as many physical sheets. The difference is not academic. It affects completeness checking, value, and the weight of the book in your hand.
xii, 248 p., 12 folding maps — Twelve maps that fold out, each larger than the page size. Essential for atlases, travel books, and military histories. "Folding" is important: a folding map is more fragile, more often damaged, and more often missing than a bound-in plate.
2 v. (xii, 340; viii, 298 p.) — Two volumes. The first has twelve preliminary pages and 340 text pages. The second has eight preliminary pages and 298 text pages. The semicolon separates volumes.
3 vols. in 2 — Three bibliographic volumes bound in two physical books. Common in nineteenth-century three-decker novels that were later rebound for economy. The volume is the intellectual unit; the book is the physical object. They don't always match.
You enter pagination in Shelvd's Pagination field exactly as shown. The catalog entry generator passes it through unchanged — because pagination notation is already standardised, and reformatting it would lose information.
Collation: The Anatomy Lesson
If pagination tells you how many pages a book has, collation tells you how the book was made — how the printed sheets were folded and gathered into the sections (called gatherings, quires, or signatures) that were then sewn together to form the text block. Collation notation is primarily used for rare and early books, where physical structure is evidence of printing history.
A–Z⁸ — Gatherings A through Z, each consisting of 8 leaves. The superscript number indicates leaves per gathering. This is the standard octavo structure: each printed sheet folded three times to produce eight leaves (sixteen pages). Twenty-three gatherings of 8 leaves gives you 184 leaves, or 368 pages.
A–Z⁸, Aa–Cc⁴ — After exhausting the single-letter alphabet, the printer doubled up: Aa, Bb, Cc. These final gatherings have only 4 leaves each, suggesting the text ran slightly longer than the main alphabet could accommodate.
π⁴ A–Z⁸ — The Greek letter pi (π) indicates unsigned preliminary leaves — pages at the beginning that fall outside the regular signature sequence. Typically the half-title, title page, dedication, and contents. The ⁴ means four such leaves.
χ² — Chi (χ) indicates unsigned leaves inserted between regular gatherings, often added after the main printing — an errata slip, a cancel leaf replacing a page with errors, or an additional plate.
Collation lives in Shelvd's Signatures field. If you're cataloging post-1900 books, you'll likely never use it. If you're cataloging incunabula or early printed books, it's the single most important field in the record — because collation is how you prove your copy is complete.
Trade Abbreviations: The Shorthand of the Sale
Beyond the formal notation systems, the antiquarian book trade has developed its own set of abbreviations — compact, standardised, and used with the confidence of a profession that has been describing objects for centuries.
Condition and binding: t.e.g. (top edge gilt), a.e.g. (all edges gilt), g.e. (gilt edges — usually meaning all), d.w. or d.j. (dust wrapper / dust jacket), o.p. (out of print). A dealer writing "orig. cl., t.e.g., d.w." is saying: original cloth binding, top edge gilded, dust wrapper present. Seven words compressed to four abbreviations. The trade values economy in description almost as much as it values economy in pricing — which is to say, considerably.
Illustration and format: illus. (illustrations), col. (coloured), front. or frontis. (frontispiece), engr. (engraved), lith. (lithograph), port. (portrait), pl. (plates), f. or fol. (folio), 4to (quarto), 8vo (octavo), 12mo (duodecimo), sm. (small), lg. or lge. (large).
Extent and structure: p. (pages), pp. (pages, plural — though p. is now preferred for both), ff. (folios/leaves), vols. (volumes), pt. or pts. (part/parts), n.p. (no place, or no publisher — ambiguous and therefore best avoided in favour of the more precise s.n. and S.l.).
The whole description: A dealer might write: "First edition. 8vo, orig. cl., t.e.g. xii, 342 p., 16 pl. (4 col.). Spine sl. sunned, corners sl. bumped, else near fine." Twenty-three words. A full physical description, condition assessment, and implicit guarantee of completeness. You could read it in ten seconds and decide whether to buy.
A Note on Transcription
The golden rule, which governs everything above: transcribe what the book says; bracket what you supply. This sounds simple. In practice, it requires discipline.
If the title page spells the author's name wrong, you transcribe it wrong and add [sic] or a note. If the date is printed in Roman numerals, you may convert to Arabic — MDCCCXLVII [1847] — but the original is preserved. If the title page capitalises every noun in the German fashion, you capitalise every noun. The catalog entry is a faithful witness, not an editor. Your opinions about spelling, capitalisation, and typography go in the notes, not in the transcription.
This principle extends to Shelvd's Title field: enter the title as it appears on the title page, not as it appears on the spine, the cover, or Amazon. The spine title of a Victorian novel was often shortened by the binder. The cover title may differ from the title page by a word or two. The title page is the chief source of information — always has been, across every cataloging standard since Panizzi. Everything else is secondary.
Using This in Shelvd
Every notation described here has a home in Shelvd's cataloging fields:
| What you're recording | Where it goes | Example |
|---|---|---|
| Uncertain publication date | Publication Year | [ca. 1850] or [1847?] |
| Unknown publisher | Publisher | (leave empty; ISBD entry inserts [s.n.]) |
| Unknown place | Publication Place | (leave empty; ISBD entry inserts [S.l.]) |
| Title with errors | Title | The Wolrd of Art (transcribe as printed) |
| Pagination with unnumbered pages | Pagination | [4], xvi, 342, [2] p., [16] leaves of plates |
| Collation formula | Signatures | π⁴ A–Z⁸ Aa–Cc⁴ |
| Edge treatment | Condition Notes or dedicated field | t.e.g. |
| No date determinable | Publication Year | n.d. |
| Approximate date | Publication Year | [ca. 1920] or c.1920 |
The catalog entry generator handles the formatting: Trade entries use trade abbreviations, ISBD entries use prescribed punctuation and Latin abbreviations. You don't need to remember which system uses what. You just need to enter the information honestly — brackets where brackets are due, question marks where certainty fails — and let the system do the rest.
Why This Matters
At the most basic level, understanding notation makes you a better reader of other people's catalogs. When a dealer writes [1847?], you now know they're unsure — and you can decide whether the uncertainty affects the price. When an auction catalog lists [4], xvi, 342, [2] p., [16] leaves of plates and your copy has only 14 plates, you know you're missing two. When a library record shows [S.l.] : [s.n.], you know that whoever cataloged the book couldn't determine where or by whom it was published — which is either a problem or an opportunity, depending on whether you enjoy research.
At a deeper level, the notation system is an ethics of description. The brackets are not just punctuation — they are a commitment to distinguishing fact from inference, the book's testimony from the cataloger's. A catalog entry without brackets claims that everything in it comes from the book. A catalog entry with brackets admits that some of it doesn't. The first is confident. The second is honest. In the rare book trade, honesty is worth more.
Every bracket you type in Shelvd is a small act of intellectual honesty. Which may be the most bibliographic sentence ever written, but that doesn't make it untrue.