This article analyzes the common Slavic linguistic atlas maps (OLA). Assessing the preliminary results of the OLA project, the author focused her attention on the new linguistic geography data given in the Atlas, and the evolution of some units and Proto-Slavic dialect differentiation of Slavia.
The text is an overview of the first volume of the lexical atlas of the Russian folk dialects. It presents modern cartographic methods used in the volume and types of maps contained therein. In order to better present the volume, one exemplary map is analysed, indicating its advantages and drawbacks. In conclusion the richness of the Russian dialectal lexical material, which was precisely geographically located, is stressed. This is the biggest merit of the atlas.