At head of title: State of Illinois. Department of registration and education. Division of the State geological survey."Presented at the Twenty-eighth annual meeting of the Mississippi valley conference of state highway departments, Chicago, February 7, 1936.
At head of title: State of Illinois. Department of registration and education. Division of the State...
At head of title: State of Illinois. Department of registration and education. Division of the state...
"Reprinted from Transactions of the Illinois State Academy of Science, v. 18, 1925.""Printed by auth...
At head of title: State of Illinois ... Dept. of registration and education ... Division of the Stat...
At head of title: State of Illinois, Dwight H. Green, Governor. Department of Registration and Educa...
At head of title: State of Illinois. Department of registration and education. State geological surv...
At head of title: State of Illinois ... Dept. of registration and education ... Division of the Stat...
"This booklet was prepared in observance of the 75th anniversary of the Illinois State Geological Su...
At head of title: State of Illinois ... Department of Registration and Education. Geological Survey ...
At head of title: State of Illinois ... Department of registration and education. Division of the St...
Includes glossary."Report date: December 1986"--Technical report standard title page.Final report.Sp...
At head of title: State of Illinois. Department of Registration and Education. A.M. Shelton, Directo...
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 State geologic...
Cover title.At head of title: State of Illinois. Department of Registration and Education. Division ...
At head of title: State of Illinois. Department of registration and education. Division of the State...
At head of title: State of Illinois. Department of registration and education. Division of the state...
"Reprinted from Transactions of the Illinois State Academy of Science, v. 18, 1925.""Printed by auth...
At head of title: State of Illinois ... Dept. of registration and education ... Division of the Stat...
At head of title: State of Illinois, Dwight H. Green, Governor. Department of Registration and Educa...
At head of title: State of Illinois. Department of registration and education. State geological surv...
At head of title: State of Illinois ... Dept. of registration and education ... Division of the Stat...
"This booklet was prepared in observance of the 75th anniversary of the Illinois State Geological Su...
At head of title: State of Illinois ... Department of Registration and Education. Geological Survey ...
At head of title: State of Illinois ... Department of registration and education. Division of the St...
Includes glossary."Report date: December 1986"--Technical report standard title page.Final report.Sp...
At head of title: State of Illinois. Department of Registration and Education. A.M. Shelton, Directo...
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 State geologic...
Cover title.At head of title: State of Illinois. Department of Registration and Education. Division ...
At head of title: State of Illinois. Department of registration and education. Division of the State...
At head of title: State of Illinois. Department of registration and education. Division of the state...
"Reprinted from Transactions of the Illinois State Academy of Science, v. 18, 1925.""Printed by auth...