Vol. s4-28, Issue 168, 1909December 01, 1909 EDT
The Ordovician and Silurian Formations in Alexander County, Illinois
The Ordovician and Silurian Formations in Alexander County, Illinois
Thomas Edmund Savage,
Savage, T. E. (1909). The Ordovician and Silurian formations in Alexander County, Illinois. American Journal of Science, s4-28(168), 509–519. https://doi.org/10.2475/ajs.s4-28.168.509