* Early American history: His most notable work was "The First Century of the Massachusetts Bay Colony, 1630-1730" (1930). It's a comprehensive and detailed account of the colony's early years, covering its political, social, and economic development.
* French Revolution: He also wrote "The French Revolution, 1789-1815" (1901), a study of the revolution and its aftermath.
He wrote other books and articles on topics including:
* American history: "The Life of William Pitt the Younger" (1910) and "The American Idea" (1924)
* History of higher education: "History of the House of Representatives of the United States, 1789-1807" (1917)
* Educational essays: "Education in the United States" (1921)
While not as widely known as some other historians, William Morse Cole's work provided valuable contributions to the understanding of American history and the French Revolution. His scholarship was appreciated in his time and continues to be relevant for historians today.