Recently I came across this old statistical map of coal production in Don Basin, dated from 1921. Despite the fact it has been done in the previous century it has some nice details in it - not only the trolleys are indicating the amount of coal per region, but colors as well.
The original name of poster 'Chego Rossiia zhdet ot Donbassa v [19]21 godu' might be translated as 'What does Russia expects from Don Basin in 1921'. In the right upper corner is written 'Пролетарии всех стран, соединяйтесь! - 'Workers of the world, unite!'.
found via http://roomthily.tumblr.com/
