00719naa#a2200169#i#450# EN\\bibl\116978 20260318041730.3 2712-7761 20260226b2026####ek#y0engy0150####ca RU From Professor D. P. Grigoriev’s archive: letters from Academicians N. V. Belov and A. V. Shubnikov Journal article Syktyvkar FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences" 2026 9 с. Journal article local Общие вопросы. 553.061 Геология. Геологические и геофизические науки. 55 Voytehovskiy Yuri Leonidovich ras.editorum.ru