EnvironmentFebruary 10, 1912
How the Scientific Farmer Fertilizes His Soil
Laboratory Methods Applied to Agriculture
Stories by W. H. Beal
The SciencesFebruary 18, 1911
The New Science of the Soil
Bacteriology and Chemistry on the Farm
How the Scientific Farmer Fertilizes His Soil
Laboratory Methods Applied to Agriculture
The New Science of the Soil
Bacteriology and Chemistry on the Farm