1. Archival and oral sources
2. Gosudarstvennii Arkhiv Noveishei Istorii Ul’yanovskoi Oblasti (hereafter GANIUO), Fond 8, Opis’ 62, Delo 59, list 19, “Perepiska s CK po partiinym i khozyaistvennym voprosam”, tom 3, 1975.
3. GANIUO Fond 8, Opis’ 62, Delo 62a, list 37, “Perepiska s Sovetom Ministrov SSSR i RSFSR, Ministerstvami i Vedomstvami po Voprosam Okazaniya Pomoshchi v Razvitii Khozyaistva i Kul’tury Oboasti”, Tom 4, 1975.
4. Retired transportation planner with 40 years’ experience: Personal communication, St. Petersburg, December 2021.
5. Transportation planner with 30 years’ experience: Personal communication, Moscow, December 2021.