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  1. Apr 2023
  2. en.wikipedia.org en.wikipedia.org
    Library catalog - Wikipedia
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    1. chrisaldrich 29 Apr 2023
      Catalog cards were 2 by 5 inches (5 cm × 13 cm); the Harvard College size.

      Early library card catalogs used cards that were 2 x 5" cards, the Harvard College size, before the standardization of 3 x 5" index cards.

      Harvard College card size 2 x 5" index cards card catalogs note card sizes
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    en.wikipedia.org/wiki/Library_catalog