• Since 1873, I have been back four or five times. I have used the best cameras and the most sensitive emulsions on the market. I have snapped my shutter, morning, noon and afternoon. I have never come close to matching those first plates. (On photographing The Mountain of the Holy Cross)

    Dean Knudsen, William Henry Jackson, United States. National Park Service, Oregon Trail Museum (1997). “An eye for history: the paintings of William Henry Jackson : from the collection at the Oregon Trail Museum”