http://book.klll.cc/ebooks/author/44348.opds?sort_order=release_date 2025-11-17T18:34:13Z Books by Conz, Gustav Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-17T18:34:13Z http://de.wikipedia.org/wiki/Gustav_Conz See also: de.wikipedia 2025-11-17T18:34:13Z https://book.klll.cc/ebooks/47502.opds Lehrbuch der Perspective (German) Gustav Conz