Project Gutenberg 2010-09-07 Public domain in the USA. 207 Planck, Max 1858 1947 Planck, Max Karl Ernst Ludwig Clarke, Hans Thacher 1887 1972 Clarke, H. T. (Hans Thacher) Silberstein, Ludwik 1872 1948 Silberstein, L. (Ludwik) 22016921 The Origin and Development of the Quantum Theory en Quantum theory QC Text 325386 2010-09-07T07:30:45 application/pdf 10981 2025-07-13T13:37:30.626506 application/rdf+xml 75376 2010-09-07T07:30:45 application/prs.tex 16825 2025-07-13T13:37:30.393530 image/jpeg 3646 2025-07-13T13:37:30.153511 image/jpeg 307349 2010-09-07T07:30:45 application/octet-stream application/zip 25467 2010-09-07T07:30:45 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia en.wikipedia en.wikipedia