NASA Thesaurus Combined File Postings Statistics (cumulative)

摘要

The NASA Thesaurus Combined File Postings Statistics is published semiannually (January and July). This alphabetical listing of the 17,515 postable subject terms contained in the NASA Thesaurus is used to display the number of postings (documents) indexed by each subject term from 1968 to date. The postings totals per term are separated by announcement media into STAR, IAA, COSMIC, and OTHER - columnar entries covering the NASA document collection (1968 to date). This is a cumulative publication, and except for special cases, no reference is needed to previous issuances. Retention of the January 1992 issue could be helpful for book information. With the July 1992 issue, NALNET book statistics were replaced by COSMIC statistics for NASA funded software. File postings statistics for the Alternate Data Base covering the NASA collection from 1962 through 1967 were published on a one-time basis in September 1975. Subject terms for the Alternate Data Base are derived from the subject Authority List, reprinted 1985, which is available upon request. The distribution of 20,534,607 postings among the four announcement categories is tabulated on the last page of the NASA Thesaurus Combined File Postings Statistics.