著者
Illinois State Historical Society
3
Chicago Board of Trade
2
Illinois State Historical Library
2
Cook County (Ill.). Board of County Commissioners
1
Illinois. General Assembly. House of Representatives
1
Illinois. General Assembly. Senate
1
Illinois. Public Utilities Commission
1
United States. Climatological Service. District No. 3
1
United States. Weather Bureau
1
University of Illinois at Urbana-Champaign. Agricultural Experiment Station
1