Longworth Powers. Page of photographs of various works by Hiram Powers and two images of the artist, 186-?. Hiram Powers papers, 1819-1953. Archives of American Art, Smithsonian Institution.
John Quincy Adams. Copy of a John Quincy Adams poem to Hiram Powers, 1837 March 25. Hiram Powers papers, 1819-1953. Archives of American Art, Smithsonian Institution.
Sampson Powers. Receipt, to Alphonzo Taft signed by Sampson Powers, 1870 Jan. 18. Hiram Powers papers, 1819-1953. Archives of American Art, Smithsonian Institution.