21. Soil fertility conference in the northern states, 1926 Creator: National Fertilizer Association (1925-1955) Collection: Core Historical Literature of Agriculture Publisher: s.n.], Publication Place: [Washington, D.C. : Date: 1926 Format: Book
22. Plant nutrition and crop production Creator: Russell, Edward J. (as Sir,) 1872-1965. Collection: Core Historical Literature of Agriculture Publisher: University of California Press, Publication Place: Berkeley, Calif. : Date: 1926 Format: Book
23. Fertilizers, their sources, manufacture, and uses Creator: Cave, Herbert. Collection: Core Historical Literature of Agriculture Publisher: Sir I. Pitman & sons, ltd. Publication Place: New York : Date: 1926 Format: Book
24. 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
25. 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
26. 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
27. Handbook of fertilizers: their sources, makeup, effects and use Creator: Gustafson, Axel Ferdinand, 1880- Collection: Core Historical Literature of Agriculture Publisher: K. Paul, Trench, Trübner & Co., Ltd., Publication Place: London : Date: 1928 Format: Book
28. Theory and practice in the use of fertilizers Creator: Bear, Firman E. 1884-1967 Collection: Core Historical Literature of Agriculture Publisher: John Wiley & Sons, Inc. ; Publication Place: New York : Date: 1929 Format: Book
29. Fertilizers for greenhouse and garden crops Creator: Laurie, Alexander, 1892- Collection: Core Historical Literature of Agriculture Publisher: The A. T. De La Mare Company, Publication Place: New York, N.Y. : Date: 1929 Format: Book
30. The maintenance of soil fertility Creator: Thorne, Charles Embree, 1846-1936 Collection: Core Historical Literature of Agriculture Publisher: Orange Judd, Publication Place: New York : Date: 1930 Format: Book