The object of this experiment was to investigate the possibilities of utilizing the earth's heat near the surface to warm chicken houses, garages, and other out-buildings during extremely cold weather.
Proceedings of the Iowa Academy of Science
©1930 Iowa Academy of Science, Inc.
Crum, L. V.
"The Earth as a Source of Heat for Outbuildings,"
Proceedings of the Iowa Academy of Science, 37(1), 315-316.
Available at: https://scholarworks.uni.edu/pias/vol37/iss1/86