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  1. Ensor, P.: User characteristics of keyword searching in an OPAC (1992) 8.93 
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  2. Ensor, P.: User practices in keyword and Boolean searching on an online public access catalog (1992) 8.93 
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  3. Ensor, P.: Knowledge level of users and nonusers of keyword/Boolean searching on an online public access catalog (1992) 8.93 
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