In article researches of the Ufa historian M.I.Rodnov in which the space of the regional grain market and the mechanism of grain trade in the Ufa province are investigated are analyzed. Degree of novelty of conceptual creation of the historian investigating big of a complex of questions, connected both with the analysis of a historiography of a problem, and with studying of degree of reliability of a complex of documentary sources of various origin, including official and territorial statistics, periodicals, transport statistics and other materials is shown.