Unidentified photographer, n.d., Studio portrait of a nude young woman (French), Daguerreotype, stereo, Stereographica - Antique Photographica, Courtesy of Bryan and Page Ginns (#14 / 122), LL/11134

Unidentified photographer, 1850 (ca), [Nude], Daguerreotype, 9.1 x 6.9 cm (3 9/16 x 2 11/16 ins), Metropolitan Museum of Art, Gilman Collection, Gift of The Howard Gilman Foundation, 2005, Accession Number: 2005.100.30, LL/40477

Unidentified photographer, n.d., Jeune femme nue assise à demi accoudée sur un oreiller, Daguerreotype, Musée d'Orsay, (C) RMN (Musée d'Orsay) / Hervé Lewandowski, Europeana Identifier: RMNDO000000320380 ; PHO_1983_165_307, LL/42654

Unidentified photographer, 1855-1859, Academic study of a female nude, Daguerreotype, framed, 7.6 x 6.6 cm, Universiteit Leiden, Prentenkabinet, www.daguerreobase.org - Daguerreobase no: PKL-56.0612, LL/41463

Unidentified photographer, n.d., Female nude with bird, Daguerreotype, framed, 7.6 x 6.6 cm, Universiteit Leiden, Prentenkabinet, www.daguerreobase.org - Daguerreobase no: PKL-57.0235, LL/41464

Julien Vallou de Villeneuve, 1853 (ca), Female Nude, Reclining [in Profile], Salted paper print from paper negative, 11.2 x 15.5 cm (4 7/16 x 6 1/8 in), Metropolitan Museum of Art, Purchase, Lila Acheson Wallace Gift, 1993 (1993.69.3), LL/6310

Julien Vallou de Villeneuve, 1853 (ca), [Female nude, reclining, with arm raised (#1940)], Salted paper print from paper negative, 4 5/8 x 6 5/16 in (11.8 x 16 cm), Metropolitan Museum of Art, Purchase, Lila Acheson Wallace Gift, 1993 (1993.69.1), LL/7727

Julien Vallou de Villeneuve, 1851-1853, [Reclining Nude], Salted paper print, from paper negative, 12.3 x 16.1 cm (4 13/16 x 6 5/16 ins), Metropolitan Museum of Art, Gilman Collection, Purchase, Mrs. Walter Annenberg and The Annenberg Foundation Gift, 2005, Accession Number: 2005.100.40, LL/40453

Unidentified photographer (French), 1850s, The Spring, France, Albumen print, 22.5 x 16 cm, The Romantic Agony Book & Print Auctions, Auction 20 June 2015, Lot: 304, LL/60242

Eugène Durieu, 1853 (ca), Rückenakt, Paris, Museum Ludwig, LL/7715

Eugène Durieu, 1853-1854, [Nude Study], Albumen silver print, from glass negative, 20.5 x 12.8 cm (8 1/16 x 5 1/16 ins) (image) 32.3 x 27 cm (12 11/16 x 10 5/8 ins) (mount), Metropolitan Museum of Art, Gilman Collection, Purchase, Mr. and Mrs. Henry R. Kravis Gift, 2005, Accession Number: 2005.100.569, LL/40444

Gustave Le Gray, 1856 (ca), [Nude], Albumen silver print, from glass negative, 21.7 x 32.9 (rounded corners), Metropolitan Museum of Art, Gilman Collection, Purchase, The Horace W. Goldsmith Foundation Gift, through Joyce and Robert Menschel, 2005, Accession Number: 2005.100.274, LL/40461

Frank Chauvassaigne, 1855 (ca), Model in a White Dress with Studio Easel, Albumen print, from wet collodion negative, 8 x 5 1/2 in, J. Paul Getty Museum, The J. Paul Getty Trust (99.XM.2), LL/7957

Frank Chauvassaigne, 1858-1859, Seated Nude in Studio, Salted paper print from glass negative, 19.1 x 15.2 cm (7.5 x 6 in), Metropolitan Museum of Art, Purchase, The Horace W. Goldsmith Foundation Gift, 1998 (1998.338), LL/6320

PP, 1861 (ca), Nude reclining in a chair, Carte de visite, Larry Gottheim, Be-hold, Inc, Courtesy of Larry Gottheim - Be-Hold (56 / 15), LL/43255

PP, 1860s (ca), Crouching nude, Carte de visite, Larry Gottheim, Be-hold, Inc, Courtesy of Larry Gottheim - Be-Hold (56 / 16), LL/43256

Gaudenzio Marconi, 1870 (ca), Le Tireur d'Epine, Albumen print, 8 3/4 x 6 3/8, Charles Nes Photography LLC New York - Paris, LL/5808

Gaudenzio Marconi, 1870 (ca), Nude model for artists, Albumen print, 10 1/4 x 6 1/2, Charles Nes Photography LLC New York - Paris, LL/5810

Gaudenzio Marconi, 1870 (ca), Nude study, Albumen print, 10 1/2 x 7 3/4 in, Paul Cava Fine Art, Courtesy of Paul Cava Fine Art, LL/7757

Gaudenzio Marconi, 1870 (ca), Mary Magdalene, Albumen print, 24.3 x 15.2 cm, Israel Museum, Jerusalem, Gift of Michael S. Sachs, Westport, CT, Accession number: B01.0077, LL/40719

Louis Igout, 1875-1880, [Information sought], [Album d'Etudes, Poses], Albumen print, 200 x 135 mm, Source requested, LL/6267

Louis Igout, 1870s, Académies, Albumen print, Paul Frecker, LL/12488

Louis Igout, n.d., Kneeling male, [Studie - Etude], Cabinet card, Larry Gottheim, Be-hold, Inc, Courtesy of Larry Gottheim - Be-Hold (56 / 17), LL/43257

A. Calavas, 1870s, Nudes (21), Albumen print, 6 1/2 x 7 3/4, Klotz / Sirmon Gallery (CLOSED), LL/3356

A. Calavas, 1870s, Nudes (1), Albumen print, 8 1/4 x 6 3/4, Klotz / Sirmon Gallery (CLOSED), LL/3357

A. Calavas, 1870s, Nudes (16), Albumen print, 8 1/4 x 6 3/4, Klotz / Sirmon Gallery (CLOSED), LL/3358

E. Aubin, 1881, Etude de nu (no 32), Papier albuminé d'après négatif sur verre au collodion, 9.5 x 14 cm, Bibliothèque Nationale de France, Département des Estampes et de la Photographie, Dépôt légal 1881, LL/7785

E. Aubin, 1881, Etude de nu (no 39), Papier albuminé d'après négatif sur verre au collodion, 9.5 x 14 cm, Bibliothèque Nationale de France, Département des Estampes et de la Photographie, Dépôt légal 1881, LL/7786

E. Aubin, 1881, Etude de nu (no 15), Papier albuminé d'après négatif sur verre au collodion, 9.5 x 14 cm, Bibliothèque Nationale de France, Département des Estampes et de la Photographie, Dépôt légal 1881, LL/7787

E. Aubin, 1881, Etude de nu (no 23), Papier albuminé d'après négatif sur verre au collodion, 9.5 x 14 cm, Bibliothèque Nationale de France, Département des Estampes et de la Photographie, Dépôt légal 1881, LL/7788

Thomas Eakins, 1884-1885, Motion Study [Showing a naked Thomas Eakins], glass plate, Source requested, LL/1924

Thomas Eakins, 1880 (ca), Untitled [Pennsylvania Academy of Fine Arts], Albumen print, 4 3/16 x 3 1/4 in (10.64 x 8.26 cm) (image), Minneapolis Institute of Art - MIA, Minneapolis Institute for the Arts, Mr. and Mrs. Harrison R. Johnston, Jr. Fund (77.67), LL/7297

Thomas Eakins, 1883, Study for "Swimming", Albumen print, 6 1/16 x 7 13/16 in (15.4 x 19.8 cm), Smithsonian Hirshhorn Museum and Sculpture Garden, Gift of Joseph H. Hirshhorn, 1966, Accession Number: 83.17, LL/37585

Thomas Eakins, 1884, Marey Wheel Photographs of Thomas Eakins, Platinum print, 1 5/8 x 2 1/2 in (4.1 x 6.3 cm), Smithsonian Hirshhorn Museum and Sculpture Garden, Gift of Joseph H. Hirshhorn, 1966, Accession Number: 83.38, LL/37588

Thomas Eakins, 1883, [George Reynolds: Seven Photographs], Albumen silver print, 8.1 x 18.9 cm (3 3/16 x 7 7/16 in), J. Paul Getty Museum, Object number: 84.XM.254.23, LL/50567

Unidentified photographer / artist, n.d., Three ladies in an Egyptian-style setting, Stereo, glass, 45 x 107mm, Jefferson Stereoptics, Courtesy of John Saddy (Auction, Tue, Dec 12, 2006 & Thu, Dec 14, 2006, # 06-4, Lot 178), LL/15810

Vincenzo Galdi, 1890 (ca), Group nude study, Albumen print, 6 3/8 x 8 3/4 in, Paul Cava Fine Art, Courtesy of Paul Cava Fine Art, LL/7742

Vincenzo Galdi, 1890 (ca), Nude study, Albumen print, 8 3/4 x 6 1/2 in, Paul Cava Fine Art, Courtesy of Paul Cava Fine Art, LL/7743

J.M. Cañellas, 1890 (ca), Untitled, Woman with her hair down, Albumen print, 5 3/4 x 4 in (14.7 x 10 cm), KaufmaNelson Vintage Photographs, LL/24909

J.M. Cañellas, 1890 (ca), Untitled, Portrait of a woman leaning against a chair, Albumen print, 5 7/8 x 3 7/8 in (15 x 10 cm), KaufmaNelson Vintage Photographs, LL/24947

J.M. Cañellas, 1890 (ca), Untitled, Nude before Moorish backdrop, Albumen print, 5 7/8 x 3 7/8 in (15 x 10 cm), KaufmaNelson Vintage Photographs, LL/24949

J.M. Cañellas, 1890 (ca), Untitled, Standing nude posed before a mirror, Albumen print, 5 7/8 x 4 in (15 x 10 cm), KaufmaNelson Vintage Photographs, LL/24969

Wilhelm Plüschow, 1890-1900, A portrait of a young male semi-nude with a fur wrap (Italy), Albumen print, 16 x 21.5 cm, Dennis George Crow, Courtesy of Dennis George Crow (www.dennisgeorgecrow.com), LL/10526

Wilhelm Plüschow, 1900 (ca), Untitled (Young boy leaning against rock), Albumen print, 6 1/4 x 4 1/2 in (15.9 x 11.4 cm), Swann Galleries - New York, Courtesy of Swann Galleries (Auction, Dec 7, 2006, #2097, Lot 357), LL/15991

Wilhelm von Gloeden, n.d., Boy With Fish, Gelatin silver or platinum, matte, toned, 8 1/8 x 5 3/4 in, Larry Gottheim, Be-hold, Inc, Courtesy of Larry Gottheim - Be-Hold (53 / 101), LL/32269

Wilhelm von Gloeden, 1899, November, Young male nude with terra cotta vase, Albumen print, 23 x 17 cm, Bassenge Photography Auctions, Courtesy of Bassenge, Berlin (Photography, Dec 2, 2009, Sale: 94, Lot: 4041), LL/33491

Alphonse Marie Mucha, 1900, Study for the Bosnia-Hercegovina pavilion at the World Fair, Paris, Gelatin silver print, toned, 5 x 6 3/4 in, Paul Cava Fine Art, Courtesy of Paul Cava Fine Art, LL/7730

Unknown (Italy), 1900, Untitled, Gelatin silver print, Private collection of Brad Feuerhelm, LL/20633

G.L. Arlaud, 1900 (ca), Le Roc (the Rock), [Vingt Etudes de Nu en Plein Air], Photogravure, tinted, 8 3/4 x 6 1/4 in (22 x 16 cm), KaufmaNelson Vintage Photographs, LL/24930

G.L. Arlaud, 1900 (ca), L'Ondine, [Vingt Etudes de Nu en Plein Air], Photogravure, tinted, 8 5/8 x 6 1/4 in (22 x 16 cm), KaufmaNelson Vintage Photographs, LL/24931

G.L. Arlaud, 1900 (ca), Pax, Les Baux (Peace), [Vingt Etudes de Nu en Plein Air], Photogravure, tinted, 8 3/4 x 6 in (22 x 15.5 cm), KaufmaNelson Vintage Photographs, LL/24933

G.L. Arlaud, 1900 (ca), La Grotte (the Cave), [Vingt Etudes de Nu en Plein Air], Photogravure, tinted, 6 1/4 x 8 5/8 in (16 x 22 cm), KaufmaNelson Vintage Photographs, LL/24934

Frank Brangwyn, 1895, Study for ‘Dance Panel‘ for Siegfried Bing‘s Galleries L‘Art Nouveau, Gelatin silver print, 6 1/4 x 4 1/2 in, Paul Cava Fine Art, © Paul Cava (2006) - Courtesy of Paul Cava Fine Art - Used with permission, LL/10989

Frank Brangwyn, 1916, Study for the Girl and the Fawn, Gelatin silver print, sepia-toned, matte, 8 1/2 x 6 in, Paul Cava Fine Art, © Paul Cava (2006) - Courtesy of Paul Cava Fine Art - Used with permission, LL/10990

Unidentified photographer / artist, n.d., A nude woman lying in bed, Autochrome, stereo, 6 x 13 cm (2.25 x 5 in), Stereographica - Antique Photographica, Courtesy of Bryan and Page Ginns (#15 / 176), LL/11065

Unidentified photographer / artist, n.d., A nude, Autochrome, stereo, 6 x 13 cm (2.25 x 5 in), Stereographica - Antique Photographica, Courtesy of Bryan and Page Ginns (#16/190), LL/13272