<a href="https://en.wikipedia.org/wiki/Charles_Nuitter" class="extiw" title="en:Charles Nuitter">Charles Nuitter</a> (1828–1899), archivist of the Paris Opera from 1866 to 1899
Unknown photographer
User scan of Guest, Ivor, editor (1981). <i>Letters from a Ballet Master: The Correspondence of Arthur Saint-Léon</i>, following p. 62. London: Dance Books. <a href="//commons.wikimedia.org/wiki/Special:BookSources/9780903102582" title="Special:BookSources/9780903102582">ISBN 9780903102582</a>. (Reproduction of an original at the Bibliothèque de l'Opéra, Paris)