Publisher
- The Department (St. Paul, Minnesota)2
- U.S. Geological Survey (Washington, D.C)2
- Управление военных топографов РККА2
- (Canada)1
- (Ottawä)1
- Advocate-Republican1
- American Geographical Society of New York1
- Bartholomew (Edinburgh)1
- Bureau of Chemistry and Soils1
- Bureau of Public Roads1
- Dept. of the Interior (Ottawa)1
- Geographical Pub. Co (Chi[cago], Ill)1
- I.H. Ragsdale1
- Iowa City Branch of the American Association of University Women1
- Iowa Geological Survey1
- Iowa State College Library1
- Iowa. State Planning Board. Committee on Industry1
- Iowa. State Planning Board. Committee on Population and Social Trends1
- Iowa. State Planning Board. Committee on Soil Conservation1
- Iowa. State Planning Board. Health and Housing Committee1