-
621
-
622
A method of determining the net duty of irrigation water for lowland rice [microform]
Published 1976Visual Material -
623
Comparative economic analysis of low-lift (surface) and tubewell irrigation projects in the Philippines [microform]
Published 1976Visual Material -
624
Comparative economic analysis of low-lift (surface) and tubewell irrigation projects in the Philippines
Published 1976Visual Material -
625
-
626
-
627
-
628
-
629
-
630