Title: Stroitelʹstvo oboronitelʹnogo rubezha na territorii Mariĭskoĭ ASSR (1941 - 1942 gg.)
Subjects: Fortification, History, World War, 1939-1945, Engineering and construction, Female Participation, Defenses, Military History
Places: Russia (Federation), Mari El, Mari El (Russia)
Time periods: 20th century