Columbia subject headings:
Harvard subject headings:
Comparative linguistics.
German language--Translating into English
Historical linguistics.
Language and languages
Linguistics--History--19th century
Linguists--Germany--Biography.
Neogrammarians.
Paul, Hermann, 1846-1921. Prinzipien der Sprachgeschichte.
Reconstruction (Linguistics)
Princeton subject headings:
Comparative linguistics.
Language and languages.