This card file appears to consist of several filing categories and functions. Most of the cards in Box 1 function like a card catalog, with bibliographic entries arranged by the Library of Congress classification number. Starting at "BH Aesthetics" and ending with "Z [bibliography, library science and information resources]," most of the cards pertain to bibliographic sources in the study and history of architecture. According to Kimball's notations on the divider card, the other set of cards, which precede the subject cards, contain miscellaneous information and were "to be filed." Although most of these cards are subject or research related, a "personal" section is included, consisting primarily of dental X-rays and a few registration cards with the local draft board.
The information filed in Box 2 is more varied. Approximately one-third of the cards are identified as "Lists of Names" and thus function like a Rolodex file of individual and corporate names, addresses and phone numbers. The next group serves as a chronological bibliography of Kimball's writings. Most of the remaining cards pertain to Kimball's research of Samuel McIntire and Benjamin Latrobe and consist primarily of notes rather than bibliographic sources. A handful of calling cards and a 1930s list of volunteers complete the box.