00271nam a22001097a 4500003000400000008004100004082001800045100001600063245005600079260001800135300000800153OSt240311b        |||||||| |||| 00| 0 eng d  a016.631bR16I  aRamos, M.M.  aInternational bibiliography on cropping system 1975  aI R R Ic1977  a195