H. B. Willman ... [et al.]

Illinois State Geological Survey 1975 Bulletin / State of Illinois. State Geological Survey 95

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edited by Robert F. Black, Richard P. Goldthwait, H.B. Willman

Geological Society of America 1973 Memoir / Geological Society of America 136

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H.B. Willman

Illinois State Geological Survey 1971 Circular 460

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H.B. Willman ... [et al.]

Illinois State Geological Survey 1968 Bulletin / State of Illinois. State Geological Survey 92

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H.B. Willman, H.D. Glass, John C. Frye

Illinois State Geological Survey 1966 Circular / Illinois State Geological Survey no. 400 . Mineralogy of glacial tills and their weathering profiles in Illinois ; pt. 2

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