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Dr Harry W Parker. After petroleum is gone, what then? World Oil, 222 (9), September 2001, pp 70, 72, 74, 76.

Analysis of seven organic carbon sources discusses possible alternative for transportation fuels: Natural gas; Coal and lignite; Western (Greenriver) oil shale; Devonian shale; natural gas hydrates; Biomass residues; Intentionally grown biomass

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