"Zapadnye gubernii Rossii 1917" by Николай Сидоров.Original uploader was Nicolay Sidorov at ru.wikipedia.Later version(s) were uploaded by Insider at ru.wikipedia. - Transferred from ru.wikipedia(Original text : собственная работа). Licensed under Public Domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Zapadnye_gubernii_Rossii_1917.png#/media/File:Zapadnye_gubernii_Rossii_1917.png