Columbia subject headings:
Harvard subject headings:
Communication in politics--History--19th century.
Digital humanities--History.
Europe--History--Sources.
German letters--History and criticism.
Letters--History--19th century.
Letters--Political aspects--History--19th century.
Literature and technology.
Literature and the Internet.
Princeton subject headings:
Communication in politics--History--19th century.
Digital humanities--History.
Europe--History--Sources.
German letters--History and criticism.
Letters--History--19th century.
Letters--Political aspects--History--19th century.
Literature and technology.
Literature and the Internet.