The concept of “subject” in information science
Journal of Documentation
Indexing terms in the LISA database on CD-ROM
Information Processing and Management: an International Journal
Journal of the American Society for Information Science
Journal of the American Society for Information Science - Special topic issue on the history of documentation and information science: part II
An informetric study of the distribution of bibliographic records in online databases: a case study using the literature of fuzzy set theory (1965-1993)
Overlap in bibliographic databases
Journal of the American Society for Information Science and Technology
Bibliographic index coverage of a multidisciplinary field
Journal of the American Society for Information Science and Technology
Journal of the American Society for Information Science and Technology
Strategy hubs: Domain portals to help find comprehensive information
Journal of the American Society for Information Science and Technology
Intradisciplinary differences in database coverage and the consequences for bibliometric research
Journal of the American Society for Information Science and Technology
Scatter matters: Regularities and implications for the scatter of healthcare information on the Web
Journal of the American Society for Information Science and Technology
Bradford's law of scattering: ambiguities in the concept of “subject”
CoLIS'05 Proceedings of the 5th international conference on Context: conceptions of Library and Information Sciences
Theory of the topical coverage of multiple databases
Journal of the American Society for Information Science and Technology
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The distribution of bibliographic records in on-line bibliographic databases is examined using 14 different search topics. These topics were searched using the DIALOG database host, and using as many suitable databases as possible. The presence of duplicate records in the searches was taken into consideration in the analysis, and the problem with lexical ambiguity in at least one search topic is discussed. The study answers questions such as how many databases are needed in a multifile search for particular topics, and what coverage will be achieved using a certain number of databases. The distribution of the percentages of records retrieved over a number of databases for 13 of the 14 search topics roughly fell into three groups: (1) high concentration of records in one database with about 80% coverage in five to eight databases; (2) moderate concentration in one database with about 80% coverage in seven to 10 databases; and (3) low concentration in one database with about 80% coverage in 16 to 19 databases. The study does conform with earlier results, but shows that the number of databases needed for searches with varying complexities of search strategies, is much more topic dependent than previous studies would indicate.