Page xvi

Acknowledgments and Previous Reports
Many persons have contributed information and assistance as
this report was prepared. The help and encouragement of
George F. Hanson and Meredith E. Ostrom, State Geologists
and Directors (1953-1972 and 1972-, respectively), Geo-
logical and Natural History Survey, and their critical review of
the report have been invaluable in bringing this work to com-
pletion. Helpful suggestions from the following workers are
also acknowledged with gratitude: Perry Olcott, Johannes
Bouma, and Marvin T. Beatty of the Geological and Natural
History Survey; Gerhard B. Lee of the College of Agricultural
and Life Sciences; A. J. Klingelhoets, P. H. Carroll, and R. E.
Fox of the U.S. Soil Conservation Service. The list of soil scien-
tists who have worked in the field and laboratory during a span
of three quarters of a century would be long indeed, as the
bibliography indicates. If this book were dedicated to anyone,
it would be to them, who, in the words of F. H. King (1911),
walked through the fields and forests 'to learn by seeing." Im-
portant observations have come, via the author's field note-
books, from colleagues at other land grant institutions and
from soil correlators of the U.S. Soil Conservation Service,
including the following: J. K. Ableiter, William DeYoung, R. B.
Grossman, Lacy Harmon, C. E. Kellogg, I. J. Nygard, A. H.
Paschall, R. W. Simonson, and G. D. Smith. Wisconsin
county soil correlation reports of the National Cooperative Soil
Survey have been useful.
 The high quality of execution of illustrations and maps is the
contribution of R. D. Sale, M. L. Czechanski, and coworkers
of the University of Wisconsin Cartographic Laboratory at
Madison.
 Grateful acknowledgment is made of the advice on the
manuscript given by Donald F. Kaiser, Director of Editorial
and Library Services of the University of Wisconsin-Extension,
and Thompson Webb, Director of the University of Wisconsin
Press, and of the perceptive and meticulous editing done by
editors Elizabeth Steinberg of the Press and Linda B. Halsey
and Harriet M. Shetler of Extension.
 In addition to the earlier reports on the soils of the state by
T. C. Chamberlin (1883) and A. R. Whitson (1927), one by
Wilde, Wilson, and White (1949) on silvicultural aspects of our
soils has been helpful. The writer has consulted the work of
Curtis (1959) on vegetation of Wisconsin, and Martin's (1932)
Physical Geography of Wisconsin, to which readers are re-
ferred.
 M. L. Jackson and coworkers have made important contribu-
tions to the understanding of the mineralogy of Wisconsin soils.