1. The waste products of agriculture: their utilization as humus Creator: Howard, Albert, (as Sir,) 1873-1947. Collection: Core Historical Literature of Agriculture Publisher: H. Milford, Oxford University Press, Publication Place: New York : Date: 1931 Format: Book
2. Humus: origin, chemical composition, and importance in nature Creator: Waksman, Selman A. 1888-1973. Collection: Core Historical Literature of Agriculture Publisher: The Williams & Wilkins Company, Publication Place: Baltimore : Date: 1936 Format: Book
3. Pay dirt: farming & gardening with composts Creator: Rodale, J. I. 1898-1971. Collection: Core Historical Literature of Agriculture Publisher: Devin-Adair Company, Publication Place: New York : Date: 1945 Format: Book
4. Humus and the farmer, Creator: Sykes, Frank. Collection: Core Historical Literature of Agriculture Publisher: Faber and Faber limited Publication Place: London, Date: 1946 Format: Book