1. Number 30 - Phosphorus in Butter: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue
2. Number 31 - A Study of Selections for the Size, Shape, and Color of Hens' Eggs: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue
3. Number 32 - The Carbon Dioxide of the Soil Air: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue
4. Number 33 - The Ribbed Pine-Borer: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue
5. Number 34 - An Economic Study of Farm Layout: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue
6. Number 35 - Some Effects of Potassium Salts on Soils: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue
7. Number 36 - Resistance of the Roots of Some Fruit Species to Low Temperature: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue
8. Number 37 - A Modified Babcock Method for Determining Fat in Butter: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue
9. Number 38 - The Crane-Flies of New York. Part II. Biology and Phylogeny: Memoir Collection: Core Historical Literature of Agriculture Publisher: Cornell University, Agricultural Experiment Station Publication Place: Ithaca, N.Y. Date: 1920 Format: Issue