(en) Halliburton (2008), US Shale gas (White paper), juillet 2008 - voir § The Marcellus shale - Appalachian basin, p. 7/8
inist.fr
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(en) Shaffer NR, Leininger RK et Gilstrap MS (1983)Composition of the uppermost beds of the New Albany Shale in southeastern Indiana ; Eastern oil shale symposium, Lexington (13/11/1983), Ed:IMMR (Lien Ref Inist-CNRS