Columbia subject headings:
Dams.
Delaware River (N.Y.-Del. and N.J.)--Navigation.
Harvard subject headings:
Dams--New Jersey
Dams--Pennsylvania
Delaware River (N.Y.-Del. and N.J.)--Navigation.
Interstate controversies--New Jersey.
Interstate controversies--Pennsylvania.
Princeton subject headings:
Dams.
Delaware River (N.Y.-Del. and N.J.)--Navigation.