Environmental microthesaurus
Subtitle: a hierarchical list of indexing terms used by NTIS
By: National Technical Information Service, [Information Analysis Branch] and Environmental Protection Agency.
Contributors: United States. Environmental Protection Agency.
Publisher: U.S. Dept. of Commerce, National Technical Information Service
Published: 1977
Place of publication: [Springfield, Va.]
Language: eng
Number of pages: 100
Subjects: Ecology -- Research -- United States.; Human ecology -- United States.; Subject headings -- Environmental chemistry.; Subject headings -- Human ecology.; Subject headings -- Pollution.
Notes: Cover title.

"An NTIS data base reference aid."

"PB-265 261."