The New York University Archives
The Guide to the Draper Family Collection, 1836-1982, NYU archives
The Library of Congress Prints and Photographs Online Catalogue
The Brady Handy-Collection, Library of Congress
The Robert N. Dennis collection of stereoscopic views, New York Public Library
The Civil War Photographs Collection, Library of Congress
The Samuel F. B. Morse Papers, Library of Congress
The New York Public Library Digital Gallery
The I. N. Phelps Stokes Collection of American Historical Prints, New York Public Library
The Smithsonian’s History Explorer Museum Artifacts, The Smithsonian National Museum of American History
The Rail Splitter
The Beinecke Rare Book and Manuscript Library, Yale University>
Thomas Harris, Dealer in Vintage Photography