Resources
Isotope Geochemistry
http://www.osmre.gov/resources/blasting/docs/MineGasesDust/Methane.pdf
http://pa.water.usgs.gov/projects/energy/stray_gas/index.php
http://www.gwpc.org/events/gwpc-proceedings/2012-stray-gas-incidence-response-forum
PGS naturalgas.pdf
Methane 5600-FS-DEP2690.pdf
3.21.14.O&G PA publication.pdf
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