The Online Books Page

Books by Theodor Zettel:

Books in the extended shelves:

• Zettel, Theodor: Das Fluor und seine Verbindungen (M. Krayn, 1900), also by Henri Moissan and William L. Jolly (page images at HathiTrust)
• Zettel, Theodor: Nachträge zu: Der elektrische ofen. (M. Krayn, 1900), also by Henri Moissan (page images at HathiTrust)

Find more by Theodor Zettel at your library, or elsewhere.