Corals from the Chouteau and related formations of the Mississippi Valley Region,
Easton, William H. (William Heyden),
At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education, Frank G. Thompson, Director. Division of the State Geological Survey, M.M. Leighton, Chief, Urbana.
Mississippi River Valley
QE105 .A25 no.97
Illinois State Geological Survey Report of investigations no. 97