Earth history field trip for high school science teachers :
Chicago Height[s], Illinois, May 21, 1949 /
sponsored by State Geological Survey.
APA Citation
Illinois State Geological Survey. (1949). Earth history field trip for high school science teachers: Chicago Height[s], Illinois, May 21, 1949. [Champaign, Ill.: State of Illinois, Dept. of Registration and Education, State Geological Survey Division.
MLA Citation
Illinois State Geological Survey. Earth History Field Trip for High School Science Teachers: Chicago Height[s], Illinois, May 21, 1949. [Champaign, Ill.: State of Illinois, Dept. of Registration and Education, State Geological Survey Division, 1949.
Warning: These citations may not always be complete (especially for serials).