Hardy Webster Campbell

1850 – 1933

• Campbell's 1902 soil culture manual
• Campbell's 1905 Soil Culture Manual; Explains How the Rain Waters Are Stored and Conserved in the Soil; - Primary Source Edition
• Progressive agriculture, 1916
• Progressive agriculture, 1916
• Campbell's 1907 soil culture manual
• Campbell's 1907 soil culture manual
• Campbell's 1907 Soil Culture Manual: A Complete Guide to Scientific ..
• Soil culture primer