na INLIS000000000054060 20220423094354 ta 220423 g 0 eng 0010-0422000610 626.81 626.81 VAR t VARSHNEY, R.S. Theory & design of irrigation structures : volume I. channels and tubewells / R.S. Varshney, S.C. Gupta, R.L. Gupta 4th edition enlarged Roorkee : NEM Chand & Bros, 1979 xvi, 452 p. : ill. ; 21 cm. Index p. 443-452 IRRIGATIONS 3423/84