What is a watershed?

Bibliographic Details
Corporate Author:	United States. Natural Resources Conservation Service
Format:	Government Document Book
Language:	English
Published:	[Washington, D.C.] : U.S. Dept. of Agriculture, Natural Resources Conservation Service, 1996.
Edition:	Rev. Sept. 1994, slightly rev. Nov. 1999.
Series:	Program aid (United States. Department of Agriculture) ; no. 420.
Subjects:	Watersheds. Valley ecology.

Evans: US Documents (Annex 5th floor)