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- [2] Latin America and the United States, 3rd edition ANNALS OF THE AMERICAN ACADEMY OF POLITICAL AND SOCIAL SCIENCE, 1938, 200 : 337 - 338
- [4] Conservation in the United States, 3rd edition JOURNAL OF FARM ECONOMICS, 1949, 31 (02): : 371 - 373
- [9] United States Government Publications, 3rd edition COLLEGE & RESEARCH LIBRARIES, 1951, 12 (02): : 202 - 203