Ruthenberg, H.
Farming Systems in the Tropics / Hans Ruthenberg - Oxford Clarendon press 1976 - xviii, 366 p.
Includes bibliography and index
0198594585
630 / RUT
Farming Systems in the Tropics / Hans Ruthenberg - Oxford Clarendon press 1976 - xviii, 366 p.
Includes bibliography and index
0198594585
630 / RUT