Letters from N.I. Kostomarov to the editor of "Ancient and New Russia" and "Istoricheskiy Vestnik (History Messenger") S.N. Shubinsky in the Department of manuscripts of the Russian National Library
N.I. Kostomarov's letters completed with the letters of his wife, A.L. Kostomarova (1874-1885) to the editor of magazines “Ancient and New Russia” and “Istoricheskiy Vestnik (History Messenger") S.N. Shubinsky, stored in the latter's foundation in the Department of manuscripts of the Russian National Library (f. 874), the most part of which is published first, contain information reflecting the leading part Kostomarov played as an author being published in the said magazines, and the support Shubinsky lent to Kostomarov who was working at the themes of national history of the 18 <sup>th</sup> century, and some other details of Kostomarov's biography, which escaped attention of the authors of other sources.