Columbia subject headings:
Letter writing, German.
Soldiers' writings, German.
Harvard subject headings:
Colloquial language
Corpora (Linguistics)
German language--Discourse analysis
German language--Syntax
German letters--History and criticism
Letter writing, German--History.
Soldiers' writings, German--18th century--History and criticism.
Soldiers' writings, German--19th century--History and criticism.
Princeton subject headings: