Acknowledgements:
Capitol Gallery, Dordrechts Museum, Google Books, Hans P. Kraus - Jr. - Inc., Harry Ransom Humanities Research Center at the University of Texas at Austin, Harvard Fine Arts Library, Musée d'Orsay, Musée français de la Photographie, Musée Nicéphore Niépce / Museum of Photography, Museum Enschedé, National Gallery of Canada / Musée des beaux-arts du Canada, National Library of Scotland, National Museum of American History - Smithsonian Institution, National Science and Media Museum, Städtische Galerie Dresden - Kunstsammlung. |
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