* The Story of the Battle of Gettysburg (1919)
* Here Is New England! (1932)
* Brave Men (1935)
* The Life of James J. Hill (1917; two volumes)
* Robert E. Lee (1911)
Fiction:
* The Buccaneers (1926)
* The Price of Glory (1928; co-author: Charles D. Stewart)
* The House of the Two Red Roses (1932)
* Heroic Adventures (1935)
* Here Is Your War! (1938)
* The Last Chapter (1942)
* Sons of the Iron Heel (1943)
* Guerrilla (1945)
* Brave Men (1946; co-author: Richard O'Connor)
* Charge It (1946; co-author: Richard O'Connor)
* Death for Sale (1947; co-author: Richard O'Connor)
* No Questions Asked (1947; co-author: Richard O'Connor)
* The Story of Our Time (1947)
* Brave Journey (1949)
* Here Comes the Mail! (1949)
* The Spirit of America (1949)
* The Price of Salt (1952; as Patricia Highsmith)
* Talented Mr. Ripley (1955; as Patricia Highsmith)
* Deep Water (1957; co-author: Patricia Highsmith)
* The Boy Who Stole an Elephant (1959; as Patricia Highsmith)
* Purple Noon (1960; co-author: René Clément)
* The Glass Cell (1962)
* Strangers on a Train (1966)
* The Talented Mr. Ripley (1977)
* The House of the Two Red Roses (1984)