Yearbook of Agriculture. 1991 creator text Washington, D.C Department of Agriculture 1991 monographic 325 p. ilus. Department of Agriculture Agricultura E.U.A Agricultura E.U.A Agricultura Investigacion E.U.A Medio ambiente Investigación Plantas Efecto del medio ambiente 630.5 Y4 1991 5191 971013 20220329133337.0