http://book.klll.cc/ebooks/subject/36913.opds 2025-11-19T07:23:49Z Books about Mineralogy -- Illinois Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-19T07:23:49Z https://book.klll.cc/ebooks/66308.opds Guide to Rocks and Minerals of Illinois Illinois State Geological Survey