31. Fertilizers and crop production Creator: Van Slyke, Lucius L. 1859-1931 Collection: Core Historical Literature of Agriculture Publisher: Orange Judd Publishing Company, Inc., Publication Place: New York : Date: 1932 Format: Book
32. Fertilizers and food production on arable and grass land Creator: Keeble, Frederick William, (as Sir,) 1870- Collection: Core Historical Literature of Agriculture Publisher: University Press, Publication Place: Oxford : Date: 1932 Format: Book
33. Commercial fertilizers: their sources and use Creator: Collings, Gilbeart H. 1895-1964. Collection: Core Historical Literature of Agriculture Publisher: P. Blakiston's son & co., inc., Publication Place: Philadelphia : Date: 1934 Format: Book
34. Bio-dynamic farming and gardening: soil fertility renewal and preservation Creator: Pfeiffer, Ehrenfried, 1899-1961 Collection: Core Historical Literature of Agriculture Publisher: Rudolf Steiner Publishing Co., Publication Place: London : Date: 1938 Format: Book
35. Boron in agriculture Creator: Pacific Coast Borax Company. Collection: Core Historical Literature of Agriculture Publisher: Pacific Coast Borax Company, Publication Place: New York : Date: 1939 Format: Book
36. Soils and soil management Creator: Gustafson, Axel Ferdinand, 1880- Collection: Core Historical Literature of Agriculture Publisher: McGraw-Hill Book Company, Inc., Publication Place: London : Date: 1941 Format: Book
37. Artificial manures, or, The conservation and use of organic matter for soil improvement Creator: Beaumont, Arthur Bishop, 1887- Collection: Core Historical Literature of Agriculture Publisher: Orange Judd Publishing Company, Inc., Publication Place: New York : Date: 1943 Format: Book
38. 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
39. Using and managing soils Creator: Gustafson, Axel Ferdinand, 1880- Collection: Core Historical Literature of Agriculture Publisher: McGraw-Hill Book Co., Publication Place: New York : Date: 1948 Format: Book
40. Soil fertility Creator: Malherbe, Izak Devilliers, 1888- Collection: Core Historical Literature of Agriculture Publisher: Oxford University Press, Publication Place: London : Date: 1948 Format: Book