Field demostration its effects on level of knowledge, understanding and ittitudes of farmers about choice of a rice variety and use of fertilizers [microform]

Λεπτομέρειες βιβλιογραφικής εγγραφής
Κύριος συγγραφέας: Villegas, Leopoldo M.
Μορφή: Visual Material
Έκδοση: Quezon City Photoduplication Service. University of the Philippines Library 1977.
Θέματα: