http://book.klll.cc/ebooks/author/36527.opds?sort_order=title 2026-01-13T08:22:14Z Books by Silberstein, Ludwik Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2026-01-13T08:22:14Z https://en.wikipedia.org/wiki/Ludwik_Silberstein See also: en.wikipedia 2026-01-13T08:22:14Z https://book.klll.cc/ebooks/33663.opds Origin and Development of the Quantum Theory Max Planck