Manuscript entitled, Fossil Flora and Fauna of the Pennsylvanian Period, Will County, Illinois
by
George Langford (1876-1964)
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Formation mechanism of the siderite concretions that contain the fossils, pp 9-10.
Steps by which the fossiliferous siderite nodules were formed, GL's handwritten notes, page 9.
 GL's sketches of the steps by which the fossiliferous siderite nodules were formed, page 10.
Formation mechanism of the siderite fossils at Wilmington, Will County, Illinois, GL's handwritten notes, page 9
 GL sketches of the formation of siderite concretions