Includes bibliographical references."Reprinted from the Journal of Geology, vol. 56, no. 1, January, 1948.
At head of title: State of Illinois, Dwight H. Green, governor. Dept of registration and education, ...
At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education,...
"Reprinted from the Transactions of the Illinois State Academy of Science, vol. 46, pp. 142-146, 154...
Includes bibliographical references."Reprinted from the Journal of Geology, vol. 56, no. 1, January,...
Reprinted from Bull. Amer. Assoc. Petrol. Geol., Vol. 29, No. 11 (November, 1945).Cover title
At head of title: State of Illinois. Department of Registration and Education. Division of the State...
At head of title: State of Illinois ... Dept. of registration and education ... Division of the Stat...
Cover title."Reprinted from the Transactions, Illinois State Academy of Science, vol. 32, no. 2, Dec...
"Reprinted from the Transactions, Illinois State Academy of Science, vol. 36, no. 2, December, 1943....
At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education,...
At head of title: State of Illinois ... Dept. of registration and education ... Division of the Stat...
At head of title: State of Illinois. Department of registration and education. Division of the State...
Reprinted from the Annual report of the director, Department of registration and education for fisca...
Reprinted from the Journal of Paleontology, vol. 18, no. 4, July, 1944.Bibliography: p. 354
"From the Annual report of the chief to the director, Department of registration and education for f...
At head of title: State of Illinois, Dwight H. Green, governor. Dept of registration and education, ...
At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education,...
"Reprinted from the Transactions of the Illinois State Academy of Science, vol. 46, pp. 142-146, 154...
Includes bibliographical references."Reprinted from the Journal of Geology, vol. 56, no. 1, January,...
Reprinted from Bull. Amer. Assoc. Petrol. Geol., Vol. 29, No. 11 (November, 1945).Cover title
At head of title: State of Illinois. Department of Registration and Education. Division of the State...
At head of title: State of Illinois ... Dept. of registration and education ... Division of the Stat...
Cover title."Reprinted from the Transactions, Illinois State Academy of Science, vol. 32, no. 2, Dec...
"Reprinted from the Transactions, Illinois State Academy of Science, vol. 36, no. 2, December, 1943....
At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education,...
At head of title: State of Illinois ... Dept. of registration and education ... Division of the Stat...
At head of title: State of Illinois. Department of registration and education. Division of the State...
Reprinted from the Annual report of the director, Department of registration and education for fisca...
Reprinted from the Journal of Paleontology, vol. 18, no. 4, July, 1944.Bibliography: p. 354
"From the Annual report of the chief to the director, Department of registration and education for f...
At head of title: State of Illinois, Dwight H. Green, governor. Dept of registration and education, ...
At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education,...
"Reprinted from the Transactions of the Illinois State Academy of Science, vol. 46, pp. 142-146, 154...
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