Wikimedia Commons
Guard Rock, Des Moines Rapids Canal L.W.
Henry Peter Bosse (1844–1903)
photograph in the National Gallery of Art (NGA 160671)
- Date1885
- Techniquecyanotype
- Dimensions26.5 × 33.1 cm
- Exposée àNational Gallery of Art
Washington, États-Unis
_-_National_Gallery_of_Art_(Samuel_H._Kress_Foundation).jpg/500px-The_Emperor_Napoleon_in_His_Study_at_the_Tuileries%2C_by_Jacques-Louis_David_(1812)_-_National_Gallery_of_Art_(Samuel_H._Kress_Foundation).jpg)