Field studies on water use and duration for land preparation for lowland rice [microform] - Valera, Alfredo 1948- (Quezon City Photoduplication Service. University of the Philippines Library, 1980)
Microfilmed with 16 other titles.
Thesis (M.S.)
Originally published in 1977.
Keywords: Water-supply, Agricu;tural -- Philippines; Water in agriculture -- Philippines