1. Geologicheskaíä karta evropeískoí chasti SSSR i prilegaíúshchikh k neí stran : sostavlena v 1918-1922 Maps University Of Minnesota Public content 1926. Russia. Geologicheski?i? komitet. Coordinates: W 20∞--E 45∞/N 72∞--N 32∞.; Includes geologic and stratigraphic legend. 62 x 52 centimeters Scale 1:6,300,000 General Map Collection. Geologicheskii? komitet (Leningrad).