Bing found the following results
Delaware River - Wikipedia
Delaware River | Map, Crossing, George Washington, & Facts
Delaware River - American Rivers
Delaware River - WorldAtlas
Upper Delaware Scenic & Recreational River (U.S. National Park Service)
Delaware River - Encyclopedia of Greater Philadelphia
Delaware River summary | Britannica
Lower Delaware National Wild and Scenic River (U.S. National Park Service)
Delaware River Facts: Get to Know This Important Waterway
Delaware (Middle) River | Rivers.gov