TY - BOOK ED - Department of the Interior Bureau of Reclamation, TI - Operation and maintenance equipment and procedures. U1 - 621.2 OPE 1961 PY - 1961/// CY - United States PB - Department of the Interior Bureau of Reclamation KW - Water-supply engineering KW - Irrigation engineering KW - Water N1 - Establishment of desirable vegetation; Chemical preventive methods; Weed exclusion devices ER -