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Logo of mlabJournal informationSubscribeSubmissions on the Publisher web siteCurrent issue of BMLA in PMCAlso see JMLA journal in PMC
Bull Med Libr Assoc. Jan 1980; 68(1): 53–57.
PMCID: PMC226414
Random time sampling with self-observation for library cost studies: unit costs of reference questions.
C C Spencer
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