http://book.klll.cc/ebooks/author/6584.opds?sort_order=release_date 2025-11-15T04:28:28Z Books by Sommerfeld, Arnold Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-15T04:28:28Z https://en.wikipedia.org/wiki/Arnold_Sommerfeld See also: en.wikipedia 2025-11-15T04:28:28Z https://book.klll.cc/ebooks/16264.opds Deutsches Leben der Gegenwart (German) Philipp Witkop, Paul Bekker, Max Scheler, Arnold Sommerfeld, and Goetz A. Briefs