from the collection of Sir Charles Alfred Bell (1870–1945) who owned several albums and photographs that had been taken by other colonial officers working in the Himalaya; cf. "Bell Album 1, 50.31.148, National Museums Liverpool":http://www.liverpoolmuseums.org.uk/wml/collections/ethnology/asia/tibet/item-459505.aspx (accessed: 2018-12-02)