[043-20]The Mt. Simon Sandstone in Northern Illinois
Templeton, J.S. The Mt. Simon Sandstone in Northern Illinois 043-20-print
[044-14]Cambrian and Lower Ordovician, Exposures in Northern Illinois
Willman, H.B. and Templeton, J.S. Cambrian and Lower Ordovician, Exposures in Northern Illinois 044-14-print