Columbia subject headings:
Harvard subject headings:
Gazi Osman Paşa, 1832 or 1833-1900--Congresses.
Pleven (Bulgaria)--History--Siege, 1877--Congresses.
Russo-Turkish War, 1877-1878--Campaigns--Bulgaria--Congresses.
Princeton subject headings:
Gazi Osman Paşa, 1832 or 1833-1900--Congresses.
Pleven (Bulgaria)--History--Siege, 1877--Congresses.
Russo-Turkish War, 1877-1878--Campaigns--Bulgaria--Congresses.