1908
Bibliografía (9 obras)
Dictionary of agricultural and environmental science / Frederick R. Troeh and Roy L. Donahue
2003
Exploring agriculture
1979
Ethiopia: taxonomy, cartography, and ecology of soils
1972
Soils
1971
Soils of Equatorial Africa and their revelance to rational agricultural development
1970
Estimates of fertiliser consumption in India in 1970-71 (as of April 1, 1966)
1966
1958
The range and pasture book
1956
Our soils and their management
1955
