Coal Mine Subsidence

Underground mines and related subsidence potential, What Cheer, Iowa (OFR 84-3), Abstract

Underground coal mines of Centerville, Iowa and vicinity (OFR 86-2), Abstract

Abandoned underground coal mines of Des Moines, Iowa and vicinity (TP-8), Abstract

Classification of coal mine subsidence in Iowa (1987, Association of Engineering Geologists Symposium Series, Number 4, pp. 83-94), Abstract, Publication

Abandoned underground coal mines: "A study in subsidence" (Guidebook, 1987, William Penn College Office of Continuing Education)