%0 Journal Article %T From Professor D. P. Grigoriev’s archive: letters from Academicians N. V. Belov and A. V. Shubnikov %A Voytehovskiy, Y.L. %K D. P. Grigoriev, N. V. Belov, A. V. Shubnikov, personal archives, history of science, mineralogy, crystal chemistry, crystallography %J Vestnik of geosciences %D 2026 %N 0 %P 9 %I FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"