Columbia subject headings:
Höllriegel, Arnold, 1883-1939--Travel--United States.
United States--Description and travel.
Harvard subject headings:
Höllriegel, Arnold, 1883-1939--Travel--United States.
United States--Description and travel.
Princeton subject headings:
Höllriegel, Arnold, 1883-1939--Travel--United States.
United States--Description and travel.