1. Farm soils: their management and fertilization. Creator: Worthen, Edmund Louis, 1882- Collection: Core Historical Literature of Agriculture Publisher: Wiley, Publication Place: New York : Date: 1927 Format: Book
2. Fertilisers and soil improvers: description, application, and comparative value Creator: Gardner, William Collection: Core Historical Literature of Agriculture Publisher: C. Lockwood and Son, Publication Place: London : Date: 1927 Format: Book
3. Phosphoric acid, phosphates, and phosphatic fertilizers Creator: Waggaman, William Henry. Collection: Core Historical Literature of Agriculture Publisher: Chemical Catalog Company, Publication Place: New York : Date: 1927 Format: Book