Columbia subject headings:
Telephone--United States.
World War, 1914-1918--United States.
World War, 1914-1918.
Harvard subject headings:
Telephone--United States
World War, 1914-1918
World War, 1914-1918--United States
Princeton subject headings:
Telephone--United States.
World War, 1914-1918--Telephone.
World War, 1914-1918--United States.