From Professor D. P. Grigoriev’s archive: letters from Academicians N. V. Belov and A. V. Shubnikov

The article continues the publication of letters and photos of prominent Russian geologists, mineralogists, and crystallographers from the personal Professor D. P. Grigoriev’s archive, kept at the Russian Mineralogical Society, in this case from Academicians N. V. Belov and A. V. Shubnikov, leaders of Russian crystal chemistry and crystallography. The letters and photos clarity motivations and circumstances of certain events recorded in the history of science or remaining as biographical episodes. The relevance of the article lies in the need to defend the priorities of Russian science. The goal of the work is to provide the most comprehensive coverage of its history based on documents. D. P. Grigoriev's archive of letters, photos, and other documents reflects several decades of the pre-war and post-war history of Russian mineralogy and crystallography. This article is intended for professional historians of science and a wide range of science enthusiasts, including members of the Russian Academy of Sciences, university professors, postgraduate students, and undergraduates.