Columbia subject headings:
Mail preparation.
Political letter writing--United States.
United States. Congress--Constituent communication.
United States. Congress--Records and correspondence.
Harvard subject headings:
Mail preparation.
Political letter writing--United States.
United States. Congress--Constituent communication.
United States. Congress--Records and correspondence.
Princeton subject headings:
Mail preparation.
Political letter writing--United States.
United States. Congress--Constituent communication.
United States. Congress--Records and correspondence.