Columbia subject headings:
Appam (Steamship)
Germany--Foreign relations--United States.
United States--Foreign relations--Germany.
William P. Frye (Ship)
World War--1914-1918--Diplomatic history.
Harvard subject headings:
Appam (Ship)
Prussia (Germany)--Foreign relations--United States.
United States--Foreign relations--Germany--Prussia.
William P. Frye (Ship)
World War, 1914-1918--Diplomatic history
Princeton subject headings:
Appam (Ship)
Germany--Foreign relations--United States.
United States--Foreign relations--Germany.
William P. Frye (Ship)
World War, 1914-1918--Diplomatic history.