Dictionary of American Biography, Under the Auspices of the American Council of Learned SocietiesWilbur C. AbbottMay 1, 1929
History of the United States From the Compromise of 1850 to the McKinley-Bryan Campaign of 1896/the McKinley and Roosevelt Administrations, 1897-1909Wilbur C. AbbottJune 1, 1923