We don't have synonyms for card catalogs yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are card catalog and card catalogue.
(n) :
(especially US) Alternative spelling of card catalogue. [(libraries, business, chiefly historical) A collection of cards, arranged alphabetically or numerically, listing and describing materials, such as (especially) books and periodicals in a library's collections or the stock and equipment of some businesses.]
(n) :
(especially US) Alternative spelling of card catalogue. [(libraries, business, chiefly historical) A collection of cards, arranged alphabetically or numerically, listing and describing materials, such as (especially) books and periodicals in a library's collections or the stock and equipment of some businesses.]