Title: Rolʹ Peterburgskogo-Petrogradskogo-Leningradskogo voennogo okruga v obespechenii bezopasnosti Severo-Zapada Rossii
Subjects: Boundaries, Congresses, History, Military History, Peterburgskīĭ voennyĭ okrug, Petrogradskiĭ voennyĭ okrug, Soviet Union, Soviet Union. Raboche-Krestʹi︠a︡nskai︠a︡ Krasnai︠a︡ Armii︠a︡. Leningradskiĭ voennyĭ okrug
Places: Northwestern Russia