Environmental microthesaurus
Subtitle: a hierarchical list of indexing terms used by NTIS
Contributors: United States. Environmental Protection Agency
Publisher: Department of Commerce, National Tecnhical Information used bt NTIS
Place of publication: Springfield, Va
Language: eng
Subjects: Ecology; Research; Human ecology; Subject headings; Ecological research
Notes: Cover title.

"PB-265-261."

"An NTIS data base reference aid."

Sponsored by the National Technical Information Service and the Environmental Protection Agency.

May 1977.