Cartographic data of I. G. Gmelin and G. F. Miller as historical sources on the development of mining and metallurgical industry in Altai

This paper aims to analyze the maps of 2 nd Kamchatka expedition members, who have visited Upper Ob-Irtysh river in autumn 1734. As a result of comparisons of written and cartographical sources the authorship and dating of drawings, stored in the Russian Academy of Sciences Library (Department of Manuscripts), were identified.