Geological Survey of Illinois. Geology Paleontology (1866-90 volumes 2-8) ;
draftsman P. Roetter ; draftsman F. B. Meek ; draftsman J. S. Newberry ; draftsman C. K. Worthen ; draftsman L. Lesquereux ; draftsman O. St John ; draftsman E. O. Ulrich ; draftsman A. J. Ibbotson ; draftsman A. Schönborn ; artist and lithographer C. Schuchert ;
geological and paleontological drawing
Langer 1978 # 6593 ;
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