Columbia subject headings:
Merton, Thomas, 1915-1968.
Trappists--United States--Correspondence.
Harvard subject headings:
Merton, Thomas, 1915-1968
Merton, Thomas, 1915-1968--Correspondence.
Trappists--United States--Correspondence.
Princeton subject headings:
Merton, Thomas, 1915-1968.
Trappists--United States--Correspondence.