Correlates of productivity among tobacco farmers of Isabela [microform]. - Estrada, Robustiano J. 1938- (Quezon City Photoduplication Service, University of the Philippines Library, 1978)
Microfilmed with 12 other titles.
Thesis (Ph.D.)--University of the Philippines, Los Banos.
Originally published in [College, Laguna] 1974.
Keywords: Farmers -- Philippines -- Isabela; Tobacco