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Soil and crop productivity : a handbook for the use of workers in agricultural extension, vocational agriculture and farmers in India
Govinda, S. V. Rajan, (1971)
Untersuchungen über das Magnesium in den vom Landbau genutzten Böden in Südwestdeutschland
Brugger, Georg, (1959)
Lehrbuch des Ackerbaues
Roemer, Theodor, (1959)
Intellectual property rights and developing country agriculture
Perrin, Richard K., (1999)
The impact of technological change on a competitive industry
Perrin, Richard K., (1997)
[Rezension von: Sanderson, Steven E., The transformation of Mexican agriculture]
Perrin, Richard K., (1987)