1. Russian abbreviation for People’s Education Department.
2. See J.I.’s letter of December 8, 1920.
3. See: A.K. Synopalov, Transactions of the Crimean Pedagogical Inst., Book 1, 1927, p. 1 (in Russian).
4. The Central Office for Professional Education.
5. A part of Petrograd where a number of research institutes and the Polytechnic Institute were and continue to be situated.