Columbia subject headings:
Harvard subject headings:
Historic sites--Hudson River Valley (N.Y. and N.J.)--Guidebooks.
Hudson River Valley (N.Y. and N.J.)--Guidebooks.
Hudson River Valley (N.Y. and N.J.)--History.
Princeton subject headings:
Historic sites--Hudson River Valley (N.Y. and N.J.)--Guidebooks.
Hudson River Valley (N.Y. and N.J.)--Guidebooks.
Hudson River Valley (N.Y. and N.J.)--History.