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Proceedings of the Symposium Non Monetary Inputs-Field Crop Production held at Haryana Agricultural University, 11-12 February, 1978
Lamba, P. S., (19XX)
Productividad agrícola y costos de prodicción
Olalquiaga Soriano, Ramón, (1960)
Permanent and temporary manpower in day labourers farms : Transl.
Bail, A., (1957)