University of Illinois Urbana-Champaign

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Thumbnail for Roof strata of the Herrin (no. 6) coal member in mines of Illinois : their geology and stability
Roof strata of the Herrin (no. 6) coal member in mines of Illinois : their geology and stability
Krausse, Hans Friedrich; Damberger, H.H.; Nelson, W.J.; Hunt, Stephen R.; Ledvina, C.T.; Treworgy, C.G.; White, W.A.