Columbia subject headings:
Authors, German--19th century--Correspondence.
Hildebrand, Rudolf, 1824-1894--Correspondence.
Moosbrugger, Kaspar, 1830-1917--Correspondence.
Harvard subject headings:
Authors, German--19th century--Correspondence
Hildebrand, Rudolf, 1824-1894--Correspondence.
Moosbrugger, Kaspar, 1830-1917--Correspondence.
Princeton subject headings:
Authors, German--19th century--Correspondence.
Hildebrand, Rudolf, 1824-1894--Correspondence.
Moosbrugger, Kaspar, 1830-1917--Correspondence.