1850
Langenheim Brothers [Frederick and William Langenheim], 1856
Langenheim Brothers [Frederick and William Langenheim], 1860
Langenheim Brothers [Frederick and William Langenheim], 1850
![Frederick Graff's Monument at Fairmount [Philadelphia]](https://media.getty.edu/iiif/image/4e163afb-2118-4099-b09e-36526ba58d5f/full/843,/0/default.jpg)
![General View from American Side. [Niagara Falls]](https://media.getty.edu/iiif/image/1ce1938c-7811-4a5b-9b0b-95d2e6633d4a/full/843,/0/default.jpg)
![[Portrait of a Seated Little Girl in Straw Hat]](https://media.getty.edu/iiif/image/a6ce81fa-9c62-44df-80e0-753db67f33a1/full/843,/0/default.jpg)
![[Bath Island and Both Bridges over the Rapids above Cotarrait(?) House]](https://media.getty.edu/iiif/image/9cfa7930-a705-4c90-9ac3-ca98e14fe265/full/843,/0/default.jpg)