共 8 条
- [1] HANNAH HW, 1950, 660 U ILL CIRC, P44
- [2] MORGAN, 1951, MIAMI CONSERVANCY DI
- [3] *OH LEG RES COMM, 1955, 2 RES REP
- [4] ORDWAY, 1949, CONSERVATION HDB, P47
- [5] PICKELS, 1941, DRAINAGE FLOOD CONTR
- [6] ROE, 1954, ENG AGR DRAINAGE, P455
- [7] TIMMONS, 1954, JUN M WAT RES DEV CO
- [8] *US BUR CENS, 1950, DRAIN AGR LANDS, P278