By Bonsteel, Jay Allan. . Genre Soils / United States . Names soil / type / wheat / areas / area and 123 more

By Agee, Alva, 1858-1943 . Genre Fertilizers / Soils . Names soil / bacteria / plants / grass / organic matter and 1339 more

Genre Soils / Analysis . Names soil / type / wheat / ca / california and 36 more

By Morrow, Clarence Austin, 1881-1926 . Genre Soils / Analysis / Nitrogen . Names soil / ammonia / bacteria / data / organic matter and 924 more

By Emmons, Ebenezer, 1799-1863 . Genre Agriculture / New York (State) / Soils / New York (State) / Fruit-culture and 1 more . Names thorax / insects / order / musca / leaves and 4112 more

By Hoagland, D. R. (Dennis Robert), 1884-1949 . Genre Fertilizers / Soils / Analysis / Plants / Nutrition . Names soil / plants / california / roots / unidentified and 315 more

By Bonsteel, Jay Allan. . Genre Soils / United States . Names soil / type / areas / area / grass and 104 more

By Knight, Henry Granger, 1878- [from old catalog] . Genre Soils . Names soil / io / ca / indicator / none and 211 more

By Fletcher, S. W. (Stevenson Whitcomb), b. 1875 . Genre Soils . Names soil / plants / bacteria / humus / roots and 2837 more

By McCall, Arthur Gillett, 1874- . Genre Soils . Names soil / plants / roots / organic matter / rock and 364 more