Columbia subject headings:
Authors, German--19th century--Correspondence.
Editors--Germany--Correspondence.
Freytag, Gustav, 1816-1895--Correspondence.
Hartzell family--Correspondence.
Harvard subject headings:
Authors, German--19th century--Correspondence
Freytag, Gustav, 1816-1895--Correspondence.
Hirzel, Salomon--Correspondence.
Publishers and publishing--Germany--Correspondence
Princeton subject headings:
Authors, German--19th century--Correspondence.
Editors--Germany--Correspondence.
Freytag, Gustav, 1816-1895--Correspondence.
Hartzell family--Correspondence.