The EIA is always a good place to start:
http://www.eia.doe.gov/oil_gas/natur...tural_gas.html
Storage related topics:
http://tonto.eia.doe.gov/dnav/ng/ng_stor_top.asp
The NGSA's educational website:
http://www.naturalgas.org/index.asp
Browse around FERC's gas site too:
http://www.ferc.gov/industries/gas.asp
That should get you started.
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