[Administrativna karta na NR Bŭlgarii︠a︡ /
Bulgaria.Glavno upravlenie po geodezii︠a︡ i kartografii︠a︡.
Sofii︠a︡],
1973.
Shows narrow-gage and standard-gage railroads, electrified railroads, airports, ports, monasteries, monuments, and mineral springs.
Inset: [NR Bŭlgarii︠a︡, vŭzdushni linii].