General file maintained in the Business Office since 1946 when the position of Comptroller (later Controller) was created. Records were created under the administrations of Robert A. Brannan (1946-1967) and Lawrence C. Hodapp (1967-1985). Until 1967, when the Librarian assumed that function, the Comptroller/Controller was also Secretary to the Board of Trustees.

Correspondence, memoranda, statements, agreements, etc., regarding Library business affairs with auditors (Arthur Anderson & Co.), real estate management firms (G. R. Bailey & Co. and successors), the in house bindery, banks and investment firms, insurance agents, architects (Holabird & Root), legal counsel (Sidley & Austin), employees, local, state, and national government agencies, and private foundations. There is also routine trustee correspondence.