00668cam a22002297a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093100002000102245009600122260003800218300002400256490002700280650003300307650001500340700001800355710003600373830002900409CHAP20250913062743.0971013s1979            r     00010     d  a67390  a68362  a77834  cCHAP00aDvortsov, E. F. 0aHigh - powered tractors and their implements, including aspects of their impact on the soil  aNew York :bUnited Nations,c1979  a[20] p.b: gráfs. 0aAGRI/MECH reportv; 8017aLabranzaxEfecto en suelos214aTractores.0 aPolyak, A. Y.0 aComisión Económica Europea.0 aAGRI - MECH reportv; 80