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Structure of Herrin (no. 6) Coal Bed in Marion and Fayette Counties and Adjacent Parts of Bond, Clinton, Montgomery, Clay, Effingham, Washington, JeffRaymond SieverHäftad, 2021291 kr
Petrology and Sedimentation of Upper Chester Sandstones; Report of Investigations No. 170Raymond SieverHäftad, 2021245 kr
The Mississippian-Pennsylvanian Unconformity in Southern Illinois; Report of Investigations No. 152Raymond SieverHäftad, 2021244 kr
Structure of Herrin (no. 6) Coal Bed in Marion and Fayette Counties and Adjacent Parts of Bond, Clinton, Montgomery, Clay, Effingham, Washington, JeffRaymond SieverHäftad, 2021291 kr