Columbia subject headings:
Pacifism--History.
Pacifists--United States--History.
Peace--Societies, etc.--History.
Harvard subject headings:
Pacifism--History
Pacifists--United States--History.
Peace--Societies, etc.--History.
Princeton subject headings:
Pacifism--History.
Pacifists--United States--History.
Peace--Societies, etc.--History.