Columbia subject headings:
Blair, John D. (John Durbarrow), 1759-1823.
Buchanan, John, 1743-1822.
Harvard subject headings:
Blair, John Durbarrow, 1759-1823.
Buchanan, John, 1743-1822.
Princeton subject headings:
Blair, John Durbarrow, 1759-1823
Buchanan, John, 1743-1822.