000			00350nam a2200145Ia 4500
008			130223s9999 xx 000 0 und d
100			_aHay, R.C., Jones, B.A.
245			_aFarming on the contour
260			_aUrbana
260			_c1959
300			_a1 sheet
440			_aIllinois Agricultural Experiment
901			_pS1443
942			_cB _2udc
999			_c122352 _d122352