Hi, May be of interest: Map of Assessed Continuous (Unconventional) Oil Resources in the United States, 2014 http://pubs.usgs.gov/dds/dds-069/dds-069-jj/ Table 1 is quite popular: http://pubs.usgs.gov/dds/dds-069/dds-069-jj/downloads/table_1.pdf Many researchers prefer a stand alone copy; one can obtain a CD-ROM of this report by contacting: [log in to unmask] Other info: USGS World Petroleum Assessments: http://energy.usgs.gov/OilGas/AssessmentsData/WorldPetroleumAssessment.aspx USGS National Oil and Gas Assessments: http://energy.usgs.gov/OilGas/AssessmentsData/NationalOilGasAssessment.aspx Energy Data search: http://energy.usgs.gov/Tools/EnergyDataFinderSplash.aspx Enjoy the day, Emily ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Emily Wild Librarian (Physical Scientist) U.S. Geological Survey Denver Library Box 25046, MS 914 Denver Federal Center Denver, CO 80225-0046 ph: (303) 236-1003 [log in to unmask] USGS Libraries: http://library.usgs.gov Tutorials: http://tinyurl.com/lh3tmua Professional Page: http://profile.usgs.gov/ecwild ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~