00622nam a22002297a 4500003000500000005001700005008004100022010000800063011000900071035000800080040000900088082001500097110004800112245003400160260003400194300003000228490003400258500001100292650002700303650002800330830003400358CHAP20220817040759.0971013s1979            r     00010     d  a232  a1204  a380  cCHAP  a338.9bA57  aAmerican Society of Agronomy. Madison, Wis.  aAgronomyb: science in action  aMadison :bThe Society,c1979  a40 p.b: ilus. ; gráfs.  aASA special publicationv; 36  a35-18914aPolítica agrícola.14aPolítica alimentaria.0 aASA special publicationv; 36