- The Spanish Conquerors: A Chronicle of the Dawn of Empire Overseas
- Ioway to Iowa
- California Under Spain And Mexico, 1535-1847: A Contribution Toward The History Of The Pacific Coast Of The United States, Based On Original Sources ... And Mexican Archives And Other Repositories
- Appenzell, Pure Democracy And Pastoral Life In Inner-rhoden: A Swiss Study
- Rhode Island: Its Making and Its Meaning; Volume I