1. Digitized Terrain Model of the Russian Federation on a Scale of 1: 1000000 ( http://www.dataplus.ru/Soft/DigMAP/MapRussiaMill.html ).
2. State Soil-Erosion Map of Russia. Asian Part. Scale 1: 2.5 M (Pochven. inst. im. V.V. Dokuchaeva, Moscow, 2004) [in Russian].
3. E. G. Kapralov, N. V. Kolesnikova, and S. A. Miller, “30 Years of Digital Cartography in Russia: Are There Grounds to Speak about Acievements?” GIS Assots. Inf. Byull. No. 5(67), 2008.
4. The Map of Soil Reclamation Regionalization of the Agricultural Lands of the Soviet Union. 1: 0.5 M Scale (Soyuzvodproekt, Moscow, 1988) [in Russian].
5. The Map of Quaternary Deposits in the European Part of the Soviet Union and Contiguous Territories. 1: 1.5 M Scale (Aerogeologiya, Moscow, 1974) [in Russian].