96 



ILLINOIS STATE GEOLOGICAL SURVEY 



REFERENCES 



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Arnold, C. A., 1944, A heterosporous species of 

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Chaloner, W. G., 1954a, Notes on the spores of two 

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Chaloner, W. G., 1956b, Triletes palaeocristatus 

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Dijkstra, S. J., 1955a, Megasporas carboniferas 

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