Clay seams or so-called horsebacks near Springfield, Illinois

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Other| March 01, 1910

Thomas Edmund Savage

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Thomas Edmund Savage

Publisher: Society of Economic Geologists

First Online: 02 Mar 2017

Online ISSN: 1554-0774

Print ISSN: 0361-0128

Economic Geology (1910) 5 (2): 178–187.

https://doi.org/10.2113/gsecongeo.5.2.178

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