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aDepartment of Agricultural Chemistry, University of Wisconsin
1
With the assistance of E. J. RANKIN, A. D. DICKSON and H. W. LOUWSMA. Credit is due certain of the writer's colleagues for advice and assistance freely given, especially to Dr. J. G. DICKSON for aid in operating the chambers, and ERIC MILLER for access to special records of the U. S. Weather Bureau.
*
These investigations were supported by grants from the University research funds. Published with permission of the Director of the Wisconsin Agricultural Experiment Station.