Agriculture and the environment :
Agriculture and the environment :  the 1991 yearbook of agriculture / 
 - Washington, D.C. :  U.S. Govt. Print. Off. ,  c1991. 
 - v. 325 p. :  ill. ;  24 cm. 
Includes index.
Environmental policy--United States--Periodicals.
Agriculture and state--United States--Periodicals.
Agricultural ecology--United States--Periodicals.
577.55 / AGR
                        Includes index.
Environmental policy--United States--Periodicals.
Agriculture and state--United States--Periodicals.
Agricultural ecology--United States--Periodicals.
577.55 / AGR
