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Hernon, P.; McClure, C.R.: Library reference service : an unrecognized crisis - a symposium (1987)
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Hernon, P.; McClure, C.R.: Unobtrusive reference testing : the 55 percent rule (1986)
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Hernon, P.; McClure, C.R.: Quality of data issues in unobtrusive testing of library reference service : recommendations and strategies (1987)
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