- Life on a Locomotive: The Story of Buddy Williams, C & NW Engineer
- Polish Brethren: Documentation of the History and Thought of Unitarianism in the Polish Lithuanian Commonwealth and in the Diaspora
- Reconstruction: Speech of Hon. Geo. H. Williams, Delivered at Portland, Oregon, September 23d, 1867
- Wilderness and Paradise in Christian Thought
- Christian Attitudes Toward Nature