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PREFACE
This report was prepared by the U.S. Geological Survey in cooperation with the
States of Illinois, Indiana, Iowa, Minnesota, Missouri, and Wisconsin, and with other
agencies, by personnel of the Water Resources Division, E. L. Hendricks, chief
hydrologist, G. W. Whetstone, assistance chief for Scientific Publications and Data
Management, under the general direction of G. A. Billingsley, chief, Reports Section,
and B. A. Anderson, chief, Data Reports Unit.
The data were collected and computed under supervision of district chiefs, Water
Resources Division, as follows:
C. R. Collier...............................................................St. Paul, Minn.
J. L. Cook................................................................Indianapolis, Ind.
D. W. Ellis..................................................................Champaign, 111.
C. L. R. Holt, Jr...........................................................Madison, Wis.
Anthony Homyk.................................................................... Rolla, Mo.
S. W. Wiitala...............................................................Iowa City, Iowa
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