00804cam a22002177a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093082001700102100003100119245013300150260008300283300002200366490005600388650004600444650004100490830005500531CHAP20220817042755.0971013s1979            r     00010     d  a55129  a56101  a60254  cCHAP  a630.717bS4700aSepúlveda Silva, Sergio.14aThe effects of modern technology on labor for producing crops on small in two integrated rural development districts in Colombia  aIthaca, N.Y. :bNew York State College of Agriculture and Life Sciences,c1979  a61 p.b; gráfs. 0aCornell International Agriculture. Mimeographv; 6814aAgriculturaxInnovaciones tecnológicas.14aAgriculturaxTrabajadoresxColombia.0 aCornell international agriculture mimeographv; 68