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K19I
           Katz, William A
               Introduction reference work \ William A Katz - 2nd - New York : McGraw Hill, 1974.
               2v (xiii, 361; 274p.) - McGraw Hill series in library education/ed by Jean Key Gates .
                Contents: v.1. Basic information source -v.2. Reference services and reference processes

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                Subjects: Reference services (Libraries); Reference books.