The Thermal Bath in Sliven Mineral Baths. In: Marin Nitsov, Dimo Karakolev. Treatment and recovery in the Bulgarian resorts, 1968, p.68
The Thermal Bath in Sliven Mineral Baths. In: Marin Nitsov, Dimo Karakolev. Treatment and recovery in the Bulgarian resorts, 1968, p.68