Columbia subject headings:
Harvard subject headings:
Bulgaria--Description and travel.
Bulgaria--History--1762-1878.
Paniev, Nikolaĭ--Journeys--Bulgaria.
Russo-Turkish War, 1877-1878.
Princeton subject headings:
Bulgaria--Description and travel.
Bulgaria--History--1762-1878.
Paniev, Nikolaĭ--Travel--Bulgaria.
Russo-Turkish War, 1877-1878.