Ex-Library Books — What They Are and How They Affect Value

An ex-library book is any book that was previously owned by a lending library — public, academic, school, or institutional — and has been withdrawn from the collection and entered the secondary market. Ex-library copies are the most common devaluing provenance in the rare book market. The markings that libraries apply to their books — stamps, labels, pockets, barcodes, security strips, and spine lettering — are difficult or impossible to remove completely, and their presence significantly reduces a book’s collectible value.

How to Identify an Ex-Library Copy

Library ownership leaves numerous traces:

Stamps

Libraries stamp their books to mark ownership, usually on:

• Title page
• Copyright page
• Top or bottom edge of the text block (edge stamps)
• Interior pages at regular intervals (sometimes every 50th page)
• Front and rear endpapers

Stamps are typically in purple, blue, or black ink and may include the library name, city, and sometimes a classification number.

Pockets and Cards

Until the computerisation of circulation in the 1980s and 1990s, most libraries pasted a card pocket inside the rear cover or on the rear pastedown, holding a circulation card that recorded borrowing dates. When the pocket is removed, it leaves a shadow, adhesive residue, or torn paper.

Spine Labels

Libraries affix call number labels (typically white or yellow) to the base of the spine. These labels use strong adhesive; removing them often damages the cloth or paper beneath.

Barcodes and Security Strips

Modern libraries apply barcode stickers and magnetic security strips. Barcodes are usually on the inside front cover or rear pastedown. Security strips may be concealed within the binding.

Rear Cover Markings

Date-due slips (pasted inside the rear cover), “Withdrawn” or “Discarded” stamps, and deaccessioning notes.

Dust Jacket Modifications

Libraries frequently:

• Apply clear plastic lamination or mylar covers to dust jackets (sometimes permanently bonded)
• Affix library labels to the jacket
• Trim the jacket flaps and tape them to the book boards
• Clip or cover the price on the flap

Binding Reinforcement

Some libraries rebind books in plain buckram or have bindings reinforced with tape and adhesive. A book that has been “rebound for library use” bears little resemblance to the publisher’s binding.

How Ex-Library Status Affects Value

The impact on value is substantial and varies with the extent of marking and the book’s baseline collectibility:

General Rule

An ex-library copy is typically worth 50% to 80% less than a comparable non-library copy in similar physical condition. For common books, an ex-library copy may have negligible value.

Specific Impacts

Stamps on the title page — particularly damaging because the title page is the bibliographic identity of the book. Collectors view a stamped title page as a significant defect.

Edge stamps — visible when the book is closed and shelved. Difficult to remove without damaging the paper.

Pockets and residue — indicate library ownership even if other marks have been removed. Glue residue or paper shadows on endpapers cannot be fully disguised.

Rebinding — eliminates the publisher’s binding, which is integral to a book’s identity and collectibility. A rebound ex-library copy of a first edition is worth a fraction of one in the original binding.

Laminated dust jacket — the lamination process alters the jacket’s surface permanently. A laminated first-edition dust jacket has been destroyed as a collectible object.

Exceptions

In very rare cases, library provenance does not significantly reduce value or may even add interest:

Extreme rarity. If a book exists in only a handful of known copies, an ex-library copy may be the only available one. Collectors will tolerate library markings when the alternative is not owning the book at all.

Significant institutional provenance. A book from a famous library — the personal library of a notable figure, a historically important institution, or a collection with scholarly significance — may have provenance value that partially offsets the physical defects.

Working copies. For genuine research, an ex-library copy at a fraction of the price may be perfectly adequate. Scholars care about the text, not the condition.

Ethical Considerations

Removing Library Marks

Some sellers attempt to remove library marks to increase a book’s apparent value. This ranges from:

• Removing spine labels (leaving adhesive residue or damaged cloth)
• Erasing or bleaching stamps (leaving shadows or paper damage visible under UV light)
• Removing pockets (leaving torn paper or glue shadows)
• Removing date-due slips and bookplates

Removing marks without disclosure is deceptive. A reputable seller describes a book as “ex-library” even if the most obvious marks have been removed, because experienced collectors can detect residual evidence. Selling a “washed” ex-library copy as a clean copy is a form of fraud in the trade.

Deaccessioned Books

Libraries routinely withdraw (deaccession) books they no longer need. These books enter the secondary market through library sales, donations to charity shops, and bulk sales to used book dealers. There is nothing improper about buying or selling a legitimately deaccessioned book — the library made a considered decision to remove it.

However, stolen library books do circulate in the market. If a book bears library markings but lacks a “Withdrawn” or “Discarded” stamp, and the library in question still exists, the book may have been stolen. Provenance-conscious collectors verify deaccession status for valuable books.

Bookseller Descriptions

Reputable booksellers describe ex-library condition clearly:

• “Ex-library copy with usual markings” — a standard description indicating stamps, pocket, and labels
• “Ex-library, markings largely removed” — marks have been removed but evidence remains
• “Ex-library, good working copy” — the book is functional but has significant institutional wear
• “Light library markings to endpapers only” — minimal library evidence

The phrase “ex-lib” is a common abbreviation in catalogue descriptions and online listings.

Buying and Selling Ex-Library Books

As a Buyer

Ex-library copies make sense when:

• You want a reading copy of an expensive title
• The book is genuinely rare and no clean copies are available
• The price reflects the library condition (50–80% below comparable clean copies)
• You are building a research library rather than a collection

As a Seller

Be honest about ex-library status. Disclose it prominently in your description. Photograph the library markings. Price accordingly. A properly described and fairly priced ex-library copy sells to the right buyer; a deceptively described one generates returns and reputational damage.

The rare book market runs on trust, and concealing ex-library status is one of the fastest ways to lose it.