Report on the explorations of Lama Serap Gyatsho, 1856-68, Explorer K. P. 1880-84, Lama U. G. 1883, Explorer R. N. 1885-86, Explorer P. A. 1885-86 in Sikkim, Bhutan, and Tibet /
Survey of India.Trigonometrical Branch.
Thuillier, Henry Ravenshan,Sir,1838-1922.
Strahan, George,1839-1911.
Dehra Dun : Office of the Trigonometrical Branch, Survey of India,
1889.
"published under the direction of Colonel H.R. Thuillier."
Introduction by G. Strahan.
An account of the lower Tsangpo, by Lama Serap Gyatsho --  K.P.'s Narrative of a journey from Darjeeling to Gyala Sindong, Tsari and the lower Tsangpo -- Account of Lama U.G.'s third season's explorations in Tibet  -- Account of R.N.'s explorations in Sikkim, Bhutan and Tibet -- Account of P.A.'s explorations in Tibet and Bhutan.