The Online Books Page

Books by G. C. Wallis:

Books in the extended shelves:

• Wallis, G. C. (George Carroll), 1900-: The effect of season and feeds on the vitamin D content of milk under South Dakota conditions (Dairy, Dept., Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanic Arts, 1938), also by Thomas M. Olson (page images at HathiTrust)
• Wallis, G. C. (George Carroll), 1900-: Factors affecting the composition of milk (Dairy Husbandry Dept., Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanic Arts, 1939), also by D. H. Jacobsen (page images at HathiTrust)
• Wallis, G. C. (George Carroll), 1900-: How fine should grain be ground for milk cows? (Agricultural Experiment Station, South Dakota State College, 1941), also by Thomas M. Olson (page images at HathiTrust)
• Wallis, G. C. (George Carroll), 1900-: Vitamin-D deficiency in dairy cows : symptoms, causes, and treatment (Agricultural Experiment Station, South Dakota State College, 1944) (page images at HathiTrust)

Find more by G. C. Wallis at your library, or elsewhere.