Evaluating the Performance of Online Public Access Catalog: A Redefinition of Basic Measures Authors Robert N. Bland DOI: https://doi.org/10.3776/ncl.v47i3.3996 Downloads PDF Published 1989-01-01 Issue Vol 47, No 3 (1989) Section Research & Librarianship License Articles published 2023 and later: (C) The Authors, released under CC-BY license Articles published 2022 and earlier: Released under a CC-BY-NC license