http://book.klll.cc/ebooks/subject/33609.opds 2025-11-18T22:56:39Z Books about Petrology -- Missouri Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-18T22:56:39Z https://book.klll.cc/ebooks/59737.opds The Common Rocks and Minerals of Missouri W. D. Keller