found: His Spy-tech, 1985:CIP t.p. (Graham Yost)
found: His Vitamins and minerals, c1986:t.p. (Graham Yost) data sheet (b. 9/5/59)
found: Speed [MP] 1994:credits (written by Graham Yost)
found: COPICS data base, PAu1-783-478, 6/27/94(Yost, Graham)
found: Wikipedia, July 6, 2015(Graham Yost; Graham John Yost (born September 5, 1959); Canadian film and television screenwriter. His best-known works are the films Speed, Broken Arrow, and Hard Rain and the TV series Justified. In 2002, he created the widely acclaimed, yet short-lived drama series Boomtown; born in Etobicoke, Ontario; lives in California)