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12. Agricultural commerce: the organization of American commerce in agricultural commodities
13. Milk and milk products: prepared for the use of agricultural college students
14. Soils and soil management
15. Marketing purebred livestock
16. The world's grasses: their differentiation, distribution, economics and ecology
17. Forestry: a study of its origin, application and significance in the United States
18. Enzyme actions and properties
19. The Bureau of Biological Survey: its history, activities, and organization
20. Rural sociology
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