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12. Volume 6: Lake Placid Conference proceedings
13. Volume 7: Lake Placid Conference proceedings
14. Volume 8: Lake Placid Conference proceedings
15. Volume 9: Lake Placid Conference proceedings
16. Volume 10: Lake Placid Conference proceedings
17. Proceedings of the National Conference on Land Utilization, Chicago, Ill., November 19-21, 1931, called by the secretary of agriculture and the Executive Committee of the Association of Land-Grant Colleges and Universities: issued May, 1932.
18. Transactions of the Third International Congress of Soil Science, Oxford, England, 1935: Volume I. Commission Papers
19. Transactions of the Third International Congress of Soil Science, Oxford, England, 1935: Volume II. Plenary Session Papers and the Presidential Address
20. Transactions of the Third International Congress of Soil Science, Oxford, England, 1935: Volume III. Plenary and Commission Papers; Discussions; Commission and Other Reports
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