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The soil temperature observations summarized in this publication have been made possible through the cooperation of Iowa State University, the Iowa Department of Agriculture and the Weather Bureau, United States Department of Commerce. These observations constitute the only soil temperature record in Iowa of any appreciable length. Soil temperature measurements, however, have recently been initiated at Saratoga, Spencer, Council Bluffs and Burlington and are published currently by the United States Weather Bureau in the Climatological Data of Iowa (7).
Iowa State University. Agricultural and Home Economics Experiment Station
Agriculture | Soil Science
Elford, C. R. and Shaw, R. H., "The climate of Iowa: soil temperatures at Ames" (1960). Special Report. 18.