Columbia subject headings:
American literature--19th century--Periodicals.
Philosophy, American--Periodicals.
Thoreau, Henry David, 1817-1862--Periodicals.
Harvard subject headings:
American literature--19th century--Periodicals.
Princeton subject headings:
American literature--19th century--Periodicals.
Philosophy, American--Periodicals.
Thoreau, Henry David, 1817-1862--Periodicals.