000			00297nam a2200109 4500
245			_aElements of soil conservation _cHugh Hammond Bennett
100			_aBennett,Hugh Hammond
250			_a2nd. ed.
260			_aNew York _bMcGraw-Hill _cc1955
300			_ax,358p. : ill.; 21cm.
082			_a631.45 _bBEN
999			_c19181 _d19181