https://www.nber.org/papers/w15541
Founded in 1920, the NBER is a private, non-profit, non-partisan organization dedicated to conducting economic research and to disseminating research findings...
international tradedomestic regulationnber
https://www.blm.gov/congressional-testimony/american-jobs-and-energy-security-domestic-oil-shale-status-research
"American Jobs and Energy Security: Domestic Oil Shale the Status of Research, Regulation and Roadblocks"-
american jobsenergy securityoil shaledomesticstatus