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201
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202
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203
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204
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205by Horberg, Leland, 1910-1955“...Bulletin (Illinois State Geological Survey) ;...”
Published 1950
Book -
206by Willman, H. B. (Harold Bowen), 1901-Subjects: “...Geology, Stratigraphic Nomenclature Illinois....”
Published 1970
Book -
207
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208Published 1932Subjects: “...Mineral industries Illinois Periodicals....”
Serial -
209Published 1932“...Circular (Illinois State Geological Survey)...”
Serial -
210
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211by Gluskoter, Harold J. (Harold Jay), 1935-Subjects: “...Coal Illinois Sulfur content....”
Published 1968
Book -
212
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213
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214
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215by Dunbar, Carl O. (Carl Owen), 1891-1979“...Bulletin (Illinois State Geological Survey) ;...”
Published 1942
Book -
216
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217
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218
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219
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220