Columbia subject headings:
Harvard subject headings:
American literature--19th century--History and criticism
Literature and science
Princeton subject headings:
American literature--19th century--History and criticism.
Hawthorne, Nathaniel, 1804-1864.
Literature and science.
Melville, Herman, 1819-1891.
Twain, Mark, 1835-1910.
Whitman, Walt, 1819-1892.