1858, Advert for S.D. Humphrey, Photographic Chemist, Advert, Google Books, LL/34672
1858 Advert for S.D. Humphrey, Photographic Chemist
Advert Google Books Published in "Treatise of photography on collodion" by Charles Walkdeck and Peter Neff, Jr, (Second edition, Cincinnati, Longley Brothers, 1858).