1. Soil fertility diagnosis and control for field, garden, and greenhouse soils Creator: Spurway, Charles Henry. Collection: Core Historical Literature of Agriculture Publisher: Edwards Brothers, Inc., Publication Place: [Ann Arbor, Mich. : Date: 1948 Format: Book
2. Cation exchange in soils Creator: Kelley, Walter Pearson, 1878- Collection: Core Historical Literature of Agriculture Publisher: Reinhold Pub. Corp., Publication Place: New York : Date: 1948 Format: Book
3. Soil fertility Creator: Malherbe, Izak Devilliers, 1888- Collection: Core Historical Literature of Agriculture Publisher: Oxford University Press, Publication Place: London : Date: 1948 Format: Book