Prokudin-Gorskii, S.M. - Photographs For The Tsar

An excellent reference I consult whenever reading about pre-Revolutionary Russia.
Prokudin-Gorskii traveled Russia in a specially fitted Pullman coach, photographing the populace and wonders of the land.
Nicholas II approved this and was genuinely interested, though funding for the project ran out in 1917.
Prokudin-Gorskii was a pioneer in color photography (very expensive), and the book is full of images from 1906-1917.
That world, and the people in it, the villages, the buildings, the very landscape, vanished into the Great War, the Revolution, the Civil War, the Red Terror.
Luckily, his photos are easily found online.

Bonus!
Yes, you could Google around for images, but I have added a couple below:

Pinkhus Karlinskii, 1909

Greek tea gatherers, Kurdistan

Schoolboys with Rabbi, Sammarkand

Peasant women in the Ukraine

More? Larger? Go here – https://mashable.com/2014/09/30/russian-revolution-in-color/