Historical clue formulations

• Library ID — 2026-07-14
• Library fig. — 2025-11-08
• ID for a library volume — 2025-09-30
• Library catalog ID — 2025-08-30
• Abbr. in a library catalog — 2021-08-25
• Some library catalog info, for short — 2019-12-26
• Jacket letters — 2018-03-02
• Card catalog ID — 2017-08-02
• Library ID — 2017-05-22
• Library catalog ID — 2016-11-09
• Fig. for a librarian — 2016-08-07
• Amazon fig. — 2014-04-20
• Library ID — 2013-11-19
• Amazon.com ID — 2013-11-05
• Publisher's ID — 2013-10-30
• Info on the reverse of a title page: Abbr. — 2013-05-23
• 13-digit library info — 2013-05-14
• Library ID — 2013-05-13
• Library ID — 2012-02-29
• ID in a library vol. — 2011-08-09
• Novel ID — 2011-03-11
• Publisher's 13-digit ID — 2010-06-23
• Amazon.com ID — 2010-06-02
• 978-0060935443, for Roget's Thesaurus — 2009-05-04
• ID on a dust jacket — 2007-10-23
• 0-198-61186-2, e.g. — 2006-05-20
• Library ID — 2006-05-08
• Novel figure: Abbr. — 2006-04-07
• Card catalog abbr. — 2005-12-20
• Bibliophile's citation, for short — 2005-10-20
• Library cataloging datum, briefly — 2005-09-25
• Library ID — 2004-04-27
• ID in a library — 2004-02-03
• Copyright page info: Abbr. — 2003-05-14
• Novel ID — 2000-08-06