The ever-astounding Library of Congress has now digitized 1200 photographs and other images of Turkestan in the 1860s, a collection well worth browsing through. They were originally in bound volumes put together by A.L. Kuhn.
You can page through the volumes as if you had the books in your hand.
Like this fine image:
Practicing the kamancha.
LC-DIG-ppmsca-09953-00006 (digital file from Part 2, vol. 2, pl. 82, no. 267)