Unidentified photographer / artist, 1851, Untitled, Engraving, Source requested, LL/174

Unidentified photographer / artist, 1851, [Plate 7 and advertisements from Rae's Philadelphia pictorial directory & panoramic advertiser. Chestnut Street, from Fourth to Fifth Streets], Advertisement, Library Company of Philadelphia, LL/51039

1851, Book cover for Exhibition of the Works of Industry of all Nations 1851: Reports by the Juries on the subjects in the thirty classes into which the exhibition was divided, vol. II, (Spicer Brothers), Book cover, Rijksmuseum, LL/79282

City Stereoscopic Depot, 1851, Backmark for "City Stereoscopic Depot" - "Gladwell, 87 Gracechurch Street. Near the Spread Eagle.", Back label, on stereo daguerreotype, Internet - Original source ill-defined, LL/126101

City Stereoscopic Depot, 1851, Dorothea, Daguerreotype, stereo, Internet - Original source ill-defined, LL/126100

Fredricks & Weeks, 1851, Harbor of Recife, Daguerreotype, full plate, Getty Research Institute, LL/51538

Le Gray & Mestral, 1851, Arcade du cloître, Salt print, from waxed paper negative, The Hyman Collection, LL/54698

Le Gray & Mestral, 1851, West Facade of the Cathedral of Saint-Gatien, Tours, Waxed paper negative, Musée d'Orsay, LL/76177

Le Gray & Mestral, 1851, Carcassonne, vue générale des remparts prise de l'ouest, Tirage salé d'après négatif papier, Millon et Associes, LL/78264

Le Gray & Mestral, 1851, Poitiers (Vienne) - Façade ouest, église Notre-Dame-la-Grande [West front of the church of Notre-Dame-la-Grande, Poitiers], Waxed paper negative, Musée d'Orsay, LL/76176