Oldest Known Photographs of Tibet?

This photograph of Samye, taken in 1900-1901, comes to us from the Imperial Russian Geographical Society by way of the American Geographical Society. This comes from a collection that some claim as the oldest known photographs of Tibet, now available online from the University of Wisconsin (they claim copyright for the digital images).  

Actually, I think there may be some earlier British images, but above is certainly the oldest known photograph of Samye, one of three in the collection.