An economic comparison between tractor-operated and carabao-cultivated rice farms [microform] - Alviar, Nelly Guevarra 1935- (Quezon City Photoduplication Service,University of the Philippines library, 1976)
Microfilmed with 7 other titles
Thesis (M.S.)--University of the Philippines, Los Banos.
Originally published in 1969.
Keywords: Tillaged; Rice -- Implements and machinery