Margarita
I have some comments and errata for this book:
You have Countess Cantacuzene and Paley when they were both princesses
You have General Kolchak when he was an Admiral
P317 You call purishkevich a bad marksman All I can say was he was shooting at Rasputin in a low light condition with a pocket pistol that didn't have very good sights on it.
See my comments on the handguns used to kill Rasputin on the post I made on the Rasputin section of this site
I must also point out Purishkevich shot Rasputin in the early morning hours. Sound does tend to travel in the dark when it is quite. One should also point out shooting in a urban area sometimes causes the sound of the gunshot to echo.
Pages 400, 405,431 you mention the air defenses at TS. I recently made a posting on the Nicholas section of this site which deals with the Tsars air defenses
P410 You have kyrill V with the naval regiment this should be the Guards Equipage (Battalion)
P411 You have general Ruzsky at Stavka when he was at the Northern Front headquarters at Pskov
P473 on the Russian army in the Caucususes and Persia the book "Caucasian Battlefields" is a first rate book on this subject. it seems Dmitri P Welcomed there. In April 1916 a Sotnia rode across Persia and linked up with the british forces in Mespotamia and road back. In 1917 there was another link up of Russian cavalry/Cossacks with the British in "Mespot" . Arhchive.org has more on it it the book "In the Clouds Above Baghdad" also see the A,J. Barker book The negelected War/The Bastard War/The First Iraq War.
I hope this is of some interest or use. I will be reading the revised edition of your book one day.