Columbia subject headings:
Booksellers and bookselling--United States--Biography.
Dufief, N. G. (Nicolas Gouin), 1776?-1834.
Harvard subject headings:
Antiquarian booksellers--Pennsylvania--Philadelphia.
Booksellers and bookselling--Pennsylvania--Philadelphia.
Dufief, N. G. (Nicholas Gouïn), 1776?-1834--Biography.
Princeton subject headings:
Booksellers and bookselling--United States--Biography.
Dufief, N. G. (Nicolas Gouin), 1776?-1834.