ERIC - ED136766 - A Comparative Analysis of the Major ...
eric.ed.govSix major indexing and abstracting services were studied to isolate similarities and differences, obtain raw data, and attempt to estimate primary material covered by the services. The 1973 issues of all services were examined and statistics were obtained for periodical and non-periodical entries. Data were analyzed and the services compared by: (1) subject arrangement, (2) coverage and overlap of periodicals, (3) core periodicals, (4) coverage of nonjournal material and archives, (5) ...