Tkachev, P. N. Izbrannyye Sochineniya [four volumes of selected essays on socialist political themes] 1932. Subject: Socialism. Subject: Russia. Subject: Soviet Union, MGEN M5208. General Collection, GEN. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/1099624 Accessed October 18, 2024.