Columbia subject headings:
Adventure and adventurers--History--19th century.
Adventure and adventurers--History--20th century.
Travel writing--History--19th century.
Travel writing--History--20th century.
Harvard subject headings:
Adventure and adventurers in literature.
Adventure and adventurers--History--19th century.
Adventure and adventurers--History--20th century.
Adventure and adventurers--Psychological aspects.
Travel writing--History--19th century
Travel writing--History--20th century
Princeton subject headings:
Adventure and adventurers in literature.
Adventure and adventurers--History--19th century.
Adventure and adventurers--History--20th century.
Adventure and adventurers--Psychological aspects.