Earth history field trip for high school science teachers
Subtitle: Cave in Rock, Illinois, April 17, 1948
By: sponsored by State Geological Survey ; Gilbert O. Raasch, conference director ; Principal Wm. H. Riggs, conference host
Publisher: State of Illinois, Dept. of Registration and Education, State Geological Survey Division
Published: 1948
Place of publication: Champaign, Ill.]
Language: eng
Subjects: Geology
Other titles: High school science teachers earth history field trip, Cave in Rock, Illinois
Notes: Caption title.