Check this site.
http://encarta.msn.com/encyclopedia_761570872/john_d_rockefeller.html
what rich american owned most of the oil rights in america?
2 answers
This site has some interesting information.
http://www.ewg.org/oil_and_gas/execsumm.php
http://www.ewg.org/oil_and_gas/execsumm.php