1. Crop production and environment Creator: Whyte, R. O. 1903- Collection: Core Historical Literature of Agriculture Publisher: Faber and Faber Limited Publication Place: London, Date: 1946 Format: Book
2. 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