The Illinois coal measure fossils and their use in determining coal horizons: A discussion of the authenticity of Professor AH Worthen's classification of the coal seams, and the value of fossils as a means of identifying coal horizons in this state
Hubbard, George David
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https://hdl.handle.net/2142/92526
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The Illinois coal measure fossils and their use in determining coal horizons: A discussion of the authenticity of Professor AH Worthen's classification of the coal seams, and the value of fossils as a means of identifying coal horizons in this state
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