comparative evaluation of searching by controlled language and natural language in an experimental N.A.S.A. data base
By: by C.W. Cleverdon.
Series: N78 18979
Publisher: Cranfield Institute of Technology
Published: 1977
Place of publication: Cranfield, Eng
Language: eng
Number of pages: 128
Subjects: Online bibliographic searching -- Evaluation.; Information retrieval.
Notes: "European Space Agency Contract Report".

Bibliography: p. 54.

Microfiche. Springfield, VA : National Technical Information Service. -- 2 sheets.