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Techniceskie kulʹtury, kartofelʹ, ovos︣c︣e-bachc︣evye i kormovye kulʹtury
Nikolʹskaja, V. S., (1957)
Economic trends in the sweet potato industry
Harper, A. C., (1954)
La patata in Italia
Benvenuti, Antonio, (1957)
[Rezension von: Smashing the communal pot, Wang, Guichen ..]
Stone, Bruce, (1988)
Fertilizer's greener pastures : chemical fertilizers are more plentiful, but obstacles still stand between the product and the farmer
Stone, Bruce, (1989)