Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--Intellectual life--19th century--Sources.
Editors--Germany--Berlin--Correspondence.
Frederick II, King of Prussia, 1712-1786--Anniversaries, etc.
Frederick II, King of Prussia, 1712-1786. Works.
Historians--Germany--Berlin--Correspondence.
History--Research--Germany--History--19th century--Sources.
Humboldt, Alexander von, 1769-1859--Correspondence.
Preuss, Johann David Erdmann, 1785-1868--Correspondence.
Scientists--Germany--Correspondence.
Princeton subject headings:
Berlin (Germany)--Intellectual life--19th century--Sources.
Editors--Germany--Berlin--Correspondence.
Frederick II, King of Prussia, 1712-1786--Anniversaries, etc.
Frederick II, King of Prussia, 1712-1786. Works.
Historians--Germany--Berlin--Correspondence.
History--Research--Germany--History--19th century--Sources.
Humboldt, Alexander von, 1769-1859--Correspondence.
Preuss, Johann David Erdmann, 1785-1868--Correspondence.
Scientists--Germany--Correspondence.