"Map no.: B-497". Another copy of the companion text is filed in the RECAP, call number: HB3636.C4 B79 1959. Accompanied by explanatory pamphlet with title: Население Китая, МНР и Кореи : poi︠a︡snitelʹnai︠a︡ zapiska k Karte narodov / by S.I. Bruk.