The following books by Tom Hillman stress information over glossy production values, but give information not available elsewhere unless you read Russian.
This is everything you need to know about armoured cars in the RCW (and Polish-Soviet war): including organisation, doctrine and orders of battle. For pretty pictures, see the Osprey books on RCW Armour, but for detailed information this is the only real source.
A hugely detailed look at a very interesting operation which included opposed river crossings, tanks assaulting a fortified city and mass cavalry battles. Unlike so many books about military operations it gives both sides of the story.
A translation from Russian of a complete history of the most famous regiment of the RCW, from its founding to the evacuation from the Crimea. On the way it deals with a few myths about the Kornilovskis.
This is the book I wrote with Tom Hillman and Alexis Mehtidis on the French Intervention in the Ukraine in early 1919.
Email me at pygmywars[at]gmail[dot]com if you want information about obtaining pdf copies of these books.