Soil survey manual
U.S. Department of agriculture
Soil survey manual - Calcutta Oxford and I.B.H. 1966 - vii, 503p.; 23cm.- - U.S. Department Agriculture .
handbook, no. 18.
581.5 / U.S.
Soil survey manual - Calcutta Oxford and I.B.H. 1966 - vii, 503p.; 23cm.- - U.S. Department Agriculture .
handbook, no. 18.
581.5 / U.S.