id author title date pages extension mime words sentence flesch summary cache txt crl-13005 Perk, Lawrence J.; Van Pulis, Noelle Periodical Usage in an Education-Psychology Library 1977-07-01 5 .pdf application/pdf 2875 155 63 The analysis incorporated discussion of the techni.ques and limitations of journal usage studies. 13 Undoubtedly, among the major influ- ences on journal usage are indexing and abstracting services, both manual and computer-based. cache/crl-13005.pdf txt/crl-13005.txt