Guide to Rocks and Minerals of Illinois, by Anonymous 66308 [Subtitle: Educational Series 5] [Link: https://www.gutenberg.org/6/6/3/0/66308 ] [Files: 66308-0.txt; 66308-h.htm]
Thanks to Stephen Hutcheson and the Online Distributed Proofreading Team at https://www.pgdp.net Regards, Al
