21. Number 237: Bulletin Collection: Core Historical Literature of Agriculture Publisher: Cornell University Agricultural Experiment Station, New York State College of Agriculture Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
22. Number 238: Bulletin Collection: Core Historical Literature of Agriculture Publisher: Cornell University Agricultural Experiment Station, New York State College of Agriculture Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
23. Number 243: Bulletin Collection: Core Historical Literature of Agriculture Publisher: Cornell University Agricultural Experiment Station, New York State College of Agriculture Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
24. Series New, Volume 2, Number 2 - Insect Study: Home nature-study course Collection: Core Historical Literature of Agriculture Publisher: s.n. Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
25. Series New, Volume 2, Number 2, Supplement - Tree Study: Home nature-study course Collection: Core Historical Literature of Agriculture Publisher: s.n. Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
26. Series New, Volume 2, Number 3 - Plant Study: Home nature-study course Collection: Core Historical Literature of Agriculture Publisher: s.n. Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
27. Series New, Volume 2, Number 3, Supplement - Fish Study: Home nature-study course Collection: Core Historical Literature of Agriculture Publisher: s.n. Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
28. Series New, Volume 2, Number 4 - Insect Study: Home nature-study course Collection: Core Historical Literature of Agriculture Publisher: s.n. Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
29. Series New, Volume 2, Number 4, Supplement - Fish Study: Home nature-study course Collection: Core Historical Literature of Agriculture Publisher: s.n. Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue
30. Series New, Volume 3, Number 1: Home nature-study course Collection: Core Historical Literature of Agriculture Publisher: s.n. Publication Place: Ithaca, N.Y. Date: 1906 Format: Issue