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During the academic year 1958/59, a survey was made of interlibrary loan requests originating at Columbia University Medical Library. A high percentage of requests came from a relatively few requesters. However, analysis based on "one-time" and "repeat" categories for the patron and his requests indicated a situation less extreme than "monopoly use by an elite group." Requests were classed by type, age, language, title, etc., and were also correlated with such variables as citation source, requester's academic status and experience, and estimated importance of material. The analysis aims to uncover patterns significant for cooperative planning. Did the repeat and one-time requester show distinctive characteristics and habits? Which materials attracted more repeat requests? Findings generally favored cooperation, at least for a library servicing nonstudent researchers. Unpredictability of researchers' needs was noted. Apart from specific findings, this paper offers methods for statistical analysis of interlibrary loans.