With Fred Nolan, Crooker discovered a megalithic “Templar” cross in 1981, in New Ross, Nova Scotia, that he claimed in his 1998 book Tracking Treasure was the remains of “Henry Sinclair’s castle”

William S. Crooker was the President of the Association of Nova Scotia Land Surveyors 1973-1974

William S. Crooker
-The Oak Island Quest (Lancelot Press, 1978)

William S. Crooker
-Oak Island Gold (Nimbus, 1993, 2000)

William S. Crooker
-Tracking Treasure: In Search of East Coast Bounty (Nimbus, 1998)