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[6]
Northeast-Southwest compressive Stress in Alberta:evidence from oil well .2 Bell,J. S,Gough,D. J. Earth and Planetary Science Letters . 1979
[7]
Stress orientation from borehole wall fractures with examples from Colorada,East Texas and Northern Canada .2 Gough,D.I,Bell,J.S. Canadian Journal of Earth Sicences . 1982