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by Alfred Ray Harris
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The nature and properties of soils
Thomas Lyttleton Lyon
Soils of the eastern United States and their use--
Jay Allan Bonsteel
The life of George Washington
Aaron Bancroft
The nature and property of soils
Nyle C. Brady
Soil and Environmental Analysis
Keith A. Smith
Harry Oliver Buckman
Soil conditions and plant growth
Edward J. Russell
Jay A. Bonsteel
Elements of agricultural chemistry
Sir Humphry Davy
Manual of soil laboratory testing
K. H. Head
