http://book.klll.cc/ebooks/subject/23031.opds 2025-09-19T07:28:19Z Books about Mineral industries (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 2025-09-19T07:28:19Z https://book.klll.cc/ebooks/38903.opds The Business of Mining Arthur J. Hoskin