Columbia subject headings:
Ledyard, John, 1751-1789.
Melville, Herman, 1819-1891--Knowledge--Asia.
Voyages around the world.
Harvard subject headings:
Explorers--United States--Biography
Ledyard, John, 1751-1789.
Pacific Area--Discovery and exploration.
Princeton subject headings:
Ledyard, John, 1751-1789.