Environmental microthesaurus
Subtitle: a hierarchical list of indexing terms used by NTIS
Contributors: United States. Environmental Protection Agency
Publisher: Dept. of Commerce, National Tecnhical Information used bt NTIS
Place of publication: Springfield, Va
Language: eng
Number of pages: 100
Subjects: Ecology -- Research -- United States; Human ecology -- United States; Subject headings -- Ecological research; Subject headings -- Human ecology
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