Links
[1] http://www.bing.com/videos/search?q=This+Is+Nymex&&view=detail&mid=9DE87C62F2EEDD5F38939DE87C62F2EEDD5F3893&FORM=VRDGAR
[2] http://web.archive.org/web/20121002065446/http://www.rbnenergy.com/henry-the-hub-i-am-i-am-understanding-henry-hub