Columbia subject headings:
Harvard subject headings:
Orel (Orlovskai︠a︡ oblastʹ, Russia)--Directories.
Orel (Orlovskai︠a︡ oblastʹ, Russia)--Guidebooks.
Princeton subject headings:
Directories.
Guidebooks.
Orel (Orlovskai︠a︡ oblastʹ, Russia)--Directories.
Orel (Orlovskai︠a︡ oblastʹ, Russia)--Guidebooks.