Google can be a useful search tool for academic research but keep in mind, many websites may not be appropriate for your academic assignments. To learn key criteria for choosing appropriate websites, see Evaluating Websites.
The interactive map of the Soviet camps is a visual representation of the history of the Soviet camp system, which existed from 1918 to 1960. (NOTE: requires translation from Russian)
The map presented here was made in 1881, following a commission from the Ministry of Public Works of the German Empire. It describes in detail the coal supply to the Prussian territory, including routes, production, consumption, import-export, and transit nodes.
