I'm a long-term lurker, with a considerable collection of unusual Imperial & pre-1940 Soviet-era books. In a recent effort to sort my books, I came across this post, and thought it might be useful to add:
"Survival Through War and Revolution in Russia" by Dmitry Nikolaevich Fedotov-White: University of Pennsylvania Press, 1939. It is the personal narrative of an officer who fought in the Russian Navy during World War I and in Kolchak's army against the Reds, and who was captured by the latter and worked in a Bolshevik government department until 1921, when he escaped via Finland to the United States.
If anyone is interested in hearing more about it, please let me know.
Tatyana