Author:

Ravn,R.L.

Year:

1979

Title:

An introduction to the stratigraphic palynology of the Cherokee Group (Pennsylvanian) coals of Iowa.

Reference:

Ravn,R.L. (1979) An introduction to the stratigraphic palynology of the Cherokee Group (Pennsylvanian) coals of Iowa. Iowa Geological Survey,Technical Paper # 6 P. 1- 117

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