00310nam a2200109Ia 450000500170000000800410001708200140005810000150007224500600008726000450014730000080019220260224040928.0260224s9999||||xx |||||||||||||| ||und||  a631.7 MAL  aMal, B.C.  0aIntroduction to soil and water conservation engineering  aNew Delhi:. Kalyani Publiucations c2002  a429