- Briefe Schillers und Goethes an A. W. Schlegel
- The Holy Cross and Other Tales
- The Confessions of J. J. Rousseau — Complete
- With Zola in England
- Buccaneers and Pirates of Our Coasts
- The Mountains of California
- The Adventures of Akbar
- Novelle e riviste drammatiche
- La Constantin
- The Way To Geometry
- Briefe an eine Freundin
- Anzeiger des Germanischen Nationalmuseums, Jg. 1900
- A Grammar of Freethought
- Practical Education, Volume II
- The Quest of the Simple Life
- Stories for Helen
- Quotes and Images from the Writings of Abraham Lincoln
- Letters on the Improvement of the Mind, Addressed to a Lady
- Die Organisation der Rohstoffversorgung
- Valerius Terminus; of the interpretation of nature
- A Roman Singer
- The Children of the Top Floor
- A Strange Story — Volume 04
- Briefe aus der Schweiz
- Hollyhock
- Handbuch der deutschen Kunstdenkmäler, Bd.1, Mitteldeutschland, 1914
- Stickeen
- Unterhaltungen deutscher Ausgewanderten
- What to Do?
- Fifty Famous People
- Ueber Goethes Hermann und Dorothea
- Santa Teresa
- Shakespeare's Lost Years in London, 1586-1592