Columbia subject headings:
Hudson River (N.Y. and N.J.)--Description and travel.
Hudson River Valley (N.Y. and N.J.)--History.
Harvard subject headings:
Hudson River (N.Y. and N.J.)
Hudson River Valley (N.Y. and N.J.)
Princeton subject headings:
Hudson River (N.Y. and N.J.)--Description and travel.
Hudson River (N.Y. and N.J.)--History.
Natural history--Hudson River (N.Y. and N.J.).