Columbia subject headings:
Harvard subject headings:
Eagles in heraldry--Germany--Prussia.
Emblems, National--Germany--Prussia.
Geheimes Staatsarchiv Preussischer Kulturbesitz.
Heraldry--Germany--Prussia.
Prussia (Germany)--History.
Princeton subject headings:
Eagles in heraldry--Germany--Prussia.
Emblems, National--Germany--Prussia.
Geheimes Staatsarchiv Preussischer Kulturbesitz.
Heraldry--Germany--Prussia.
Prussia (Germany)--History--Archival resources.