www.ssdoo.gstc.nasa.gov/nost/isoas/ret_model.html
www.expobase.com/jlstf/idxrbts/lvl-1/wrdmrkt.asp
www.arioch.gsfc.nasa.gov/cmr/refer.htm
www.ornl.gov/sgml/wg8/document/1987.htm
www.cooker.ir.rice.edu/postgresql/maillist.html
www.nmic.doe.gov/terms/net_term.html
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