G. P. A. (George Peter Alexander) Healy. Henry Wadsworth Longfellow and his daughter, Edith, ca. 1868. Research material on George Peter Alexander Healy, 1811-1966. Archives of American Art, Smithsonian Institution.
Adolf Ferdinand Konrad. Adolf Ferdinand Konrad sketchbook of travels to Rome and Egypt, 1962-1963. Adolf Ferdinand Konrad papers, 1962-2002. Archives of American Art, Smithsonian Institution.