This book, "Jahresbericht über die Leistungen der chemischen Technologie, Volume 9", by Johannes Rudolf Wagner, Ferdinand Fischer, Paul F. Schmidt, Berthold Rassow, Friedrich Gottschalk, is a replication. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.