Books
- A History of Aeronautics
- A History of Science, I - The Beginnings of Science
- A History of Science, II - The Beginnings of Modern Science
- A History of Science, III - Modern Development of the Physical Sciences
- A History of Science, IV - Modern Development of the Chemical and Biological Sciences
- Aeroplanes and Dirigibles of War
- American Encyclopedia - Biography
- American Encyclopedia - History, I
- American Encyclopedia - History, II
- American Encyclopedia - Travel
- Dogs and All About Them
- Putnam's Word Book
- Stories of Inventors
- The Dominion of the Air - The Story of Aerial Navigation
- The History of the Telephone
- The Mastery of the Air
- The Story of Alchemy and the Beginnings of Chemistry