The materials in this series document Klein's business expenses and other records, primarily associated with his work photographing conventions and submitting conributions to SF magazines. This includes correspondence, receipts, pay stubs, convention arrangements, travel arrangements, and more. Correspondents include Gale Publishing, Davis publishing, SFWA, Julius Schwarz, Analog, and others primarly regarding photograph requests, use and credit lines, and convention plans. These materials were filed along with Jay Kay and Doris Klein's personal income taxes, which were disposed of during processing.