http://book.klll.cc/ebooks/author/53464.opds?sort_order=downloads 2025-08-30T02:32:10Z Books by Illinois State Geological Survey (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-30T02:32:10Z https://book.klll.cc/ebooks/author/53464.opds?sort_order=title Sort Alphabetically by Title 2025-08-30T02:32:10Z https://book.klll.cc/ebooks/author/53464.opds?sort_order=release_date Sort by Release Date 2025-08-30T02:32:10Z https://book.klll.cc/ebooks/66308.opds Guide to Rocks and Minerals of Illinois Illinois State Geological Survey 2025-08-30T02:32:10Z https://book.klll.cc/ebooks/65704.opds Guide to the Geologic Map of Illinois Illinois State Geological Survey 2025-08-30T02:32:10Z https://book.klll.cc/ebooks/66317.opds Inside Illinois: Mineral Resources Illinois State Geological Survey