Title: Proekt skhemy korreli︠a︡t︠s︡ii osnovnykh razrezov devonskikh, kamennougolʹnykh i permskikh otlozkeniĭ u︠i︡go-zapada Russkoĭ plarformy
Subjects: Stratigraphic Geology, Geology
Places: Russia
Time periods: Paleozoic