title: On relationship between academicians: two unknown letters of S. O. Yefremov to V. I. Vernadskyi
abstract: The aim of the work. Publication of an epistolary heritage and research of contacts, relations and cooperation between literary critic, publicist and public figure, academician of the All-Ukrainian Academy of Sciences Serhii Yefremov (1876-1939) and first president of the Ukrainian Academy Volodymyr Vernadskyi (1863-1945). The research methodology is based on the application of historical and comparative methods, source and historiographical analysis and bibliographic heuristics. Scientific nove
journal: Rukopisna ta knižkova spadŝina Ukraïni