[023-30] The Floating Principle in Ore Formation
The Floating Principle in Ore Formation Author: Stansfield, John
[023-29] On the Geology of Champaign County
On the Geology of Champaign County Author: Savage, T.E.
[023-28] The Stratigraphy of the Middle Devonian of the Tennessee Basin
The Stratigraphy of the Middle Devonian of the Tennessee Basin Author: Peoples, Joe Webb
[023-27] Coal Ball Floras of Illinois
Coal Ball Floras of Illinois Author: Noe, A.C.
[023-26] Notes on the Pennsylvanian Rocks of Jasper County, Illinois
Notes on the Pennsylvanian Rocks of Jasper County, Illinois Author: Needham, C. E.