Estimating the amount of crop residue on a field
Duley, F.L.
Estimating the amount of crop residue on a field - Washington 1958 - 31 p. - No. 136; United States Depart .
633:631.459:631.61
Estimating the amount of crop residue on a field - Washington 1958 - 31 p. - No. 136; United States Depart .
633:631.459:631.61