Columbia subject headings:
Yemen (Republic)--Description and travel.
Yemen (Republic)--History--20th century--Sources.
Yemen (Republic)--In literature.
Ḥasan, Yūsuf Bik, 1886-1969--Travel--Yemen (Republic)
Harvard subject headings:
Yemen (Republic)--History--20th century.
Yemen (Republic)--In literature.
Ḥasan, Yūsuf Bik--Travel.
Princeton subject headings:
Ḥasan, Yūsuf Bik, 1886-1969--Travel.
Yemen (Republic)--History--20th century--Sources.
Yemen (Republic)--In literature.