Columbia subject headings:
Harvard subject headings:
Cederschiöld, Gustaf, 1849-1928--Correspondence.
Gering, Hugo--Correspondence.
Mogk, Eugen, 1854-1939--Correspondence.
Philologists--Germany--Correspondence.
Philologists--Sweden--Correspondence.
Princeton subject headings:
Cederschiöld, Gustaf, 1849-1928--Correspondence.
Gering, Hugo.
Mogk, Eugen, 1854-1939.