Peter Hopkirk's The Great Game: The Struggle for Empire in Central Asia has, in duotone on its cover and also reproduced as black-and-white photograph within the body of the book, a photograph of a man in cold weather garb on a mountain top surveying the distance - telescope being supported by a leather-cased rifle.

Has anyone a source to obtain a better, larger photographic image online, or a copy of the photograph?

There should be a credit for the cover art in the book.