Availability of coal resources for mining in Illinois Middletown quadrangle, Central Illinois von Treworgy, Colin G., Coats, Gayla K., Bargh, Margaret H.

Southern Illinois mineral resources and industries von Leighton, Morris M., Voskuil, Walter H.

Industrial minerals and metals of Illinois von Lamar, John E.

Geology and mineral resources of the Dixon quadrangle von Knappen, Russell Stafford

Geology and mineral resources of the Hennepin and La Salle quadrangles von Cady, Gilbert H. 1882-

Reports of Professor Charles U. Shepard, and Forrest Shepherd, Esq respecting mineral deposits in the states of Missouri and Illinois accompanied by a map von Shepard, Charles Upham 1804-1886

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