ID for a library volume

Answer:

ISBN

Hint:

This 10- or 13-digit code helps booksellers and libraries track editions worldwide—often found near the barcode.

Explanation:

This clue refers to the unique identifier assigned to books to track and categorize them in libraries and bookstores. "ID for a library volume" directly points to the ISBN, or International Standard Book Number, which is a numeric code printed on books for easy reference. The clue is straightforward with no wordplay—it simply describes the answer’s function. Think of it like a book’s fingerprint.

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General solving tip

Match the clue's grammar: plural with plural, past with past. If the clue ends in 's' or uses a past-tense verb, mirror that form in the entry.

More tips → General Hints