TY - BOOK AU - O'Mara, Gerald T. TI - Efficiency in irrigation : the conjunctive use of surface and groundwater resources SN - 9780821310304 CY - Washington, D.C. : World Bank, ©1988. KW - Irrigation -- Economic aspects KW - Irrigation efficiency. KW - Irrigation -- Economic -- aspects Irrigation -- efficiency KW - Irrigation -- efficiency N1 - World Bank symposium ER -