For citations:

Torshin S.P., Naumov V.D., Smolina G.A. Early stages of the formation of teaching about agricultural ores (devoted to the 150 anniversary of Ya.V Samoilov). IZVESTIYA OF TIMIRYAZEV AGRICULTURAL ACADEMY. 2020;(3):150-155. (In Russ.) https://doi.org/10.26897/0021-342X-2020-3-150-155