00463nam a22001817a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093082001400102100001900116245005500135260002800190300002300218650004000241CHAP20220817042435.0971013s1976 r 00010 d a44801 a45773 a49912 cCHAP a338.1bU600aUpton, Martin. aAgricultural production economics and resource-use aLondon :bOxford,c1976 a339 p.b; gráfs.14aAgriculturaxAspectos económicos.