1. 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
2. The soil and health: a study of organic agriculture Creator: Howard, Albert, (as Sir,) 1873-1947. Collection: Core Historical Literature of Agriculture Publisher: The Devin-Adair Company, Publication Place: New York : Date: 1947 Format: Book