http://book.klll.cc/ebooks/subject/28169.opds 2025-11-14T17:55:50Z Books about Mines and mineral resources in art Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-14T17:55:50Z https://book.klll.cc/ebooks/48601.opds Album für Freunde des Bergbaues, (German) Eduard Heuchler