NTIS subject classification (past and present)
Edition: [Rev. ed.].
Series: An NTIS data base reference aid ; PB-270 575; NTIS data base reference aid ; PB-270 575
Publisher: National Technical Information Service, U.S. Department of Commerce
Published: 1978
Place of publication: Springfield, Va
Language: eng
Number of pages: 92
Subjects: Subject headings; Science; Technology; Online bibliographic searching
Notes: Cover title.

"Supersedes NTIS/SR-77/02 and NTIS/SR-75/01."