00683nam a22002417a 4500003000500000005001700005008004100022010000800063011000900071035000800080040000900088082001500097110004800112245007000160260003400230300001000264490003400274500001000308650003400318650002700352650002800379830003400407CHAP20220817040804.0971013s1971            r     00010     d  a356  a1328  a504  cCHAP  a338.9bA58  aAmerican Society of Agronomy. Madison, Wis.  aAgronomy in a changing world and research needs for the seventies  aMadison :bThe Society,c1971  a65 p.  aASA special publicationv; 19  a36-6514aAgriculturaxInvestigación.14aPolítica agrícola.14aPolítica alimentaria.0 aASA special publicationv; 19