número de documentos devueltos a los estantes

= shelving statistics

Ex. If a study must be conducted of the use made of the reference room, hourly head counts, shelving statistics, and inquiries as to the users' school or industrial affiliation may be employed.

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= shelving statistics

Ex: If a study must be conducted of the use made of the reference room, hourly head counts, shelving statistics, and inquiries as to the users' school or industrial affiliation may be employed.