Oil shale Oil shale riddle. Post Roundup F-10, 1957 Can shale oil be developed with protection for public? Post Perspective Ap 30, 1957 p.2-3 $200 million oil shale plant predicted. Post My 18, 1957 p.1 First commercial use of shale oil. Post Ag 19, 1957 p.43 Commerical shale oil to compete with crude oil in 5 years. Post 0 28, 1957 p.22 Thriving shale industry predicted in 5 years. RMN Ja 29, 1959 p.5