found: Hat Island Community, Inc. Community development study of Hat (Gedney) Island, Snohomish County, Washington, 1972.
found: Hueckel, G.J. The biological and fishery development on concrete habitat enhancement structures off Gedney Island in Puget Sound, Washington, 1983.
found: GNIS, March 19, 1999(Gedney Island, island, Wash., Snohomish Co., 48⁰00ʹ44ʺN, 122⁰19ʹ02ʺW, variant name: Hat Island)
found: Washington place names database, via WWW, March 19, 1999(Gedney Island. This mile and a half long island is three quarters of a mile wide, at the west entrance to Port Gardner Bay on Possession Sound in west central Snohomish County. The Indian name was Chuh-chuh-sul-lay, and an early alternate name was Hat Island. Cmdr. Charles Wilkes named the island for Jonathan H. Gedney, a New York inventor and personal friend.)
found: GNISisland; 48°00ʹ44ʺN 122°19ʹ02ʺW