http://book.klll.cc/ebooks/author/41063.opds?sort_order=title 2025-11-15T06:51:29Z Books by Halfer, Josef Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-15T06:51:29Z https://book.klll.cc/ebooks/41241.opds Progress of the Marbling Art, from Technical Scientific Principles Josef Halfer