A sketch of the geography and geology of the Himalaya mountains and Tibet / by Colonel S.G. Burrard, R.E., F.R.S., Superintendent, trigonometrical surveys, and H.H. Hayden, B.A., F.G.S., (later Sir Henry Hayden, Kt., C.S.I., C.I.E.), Superintendent, geological survey of India ; revised by Colonel Sir Sidney Burrard, K.C.S.I., F.R.S., and A.M. Heron, D.Sc., F.G.S., F.R.G.S., F.R.S.E., Superintendent, geological survey of India