539 oil and gas policy strategy and institutionsWB_539_OIL_AND_GAS_POLICY_STRATEGY_AND_INSTITUTIONS548 ppp in oil and gasWB_548_PPP_IN_OIL_AND_GAS2298 refineriesWB_2298_REFINERIES507 energy and extractivesWB_507_ENERGY_AND_EXTRACTIVESTax ethnicity romanianTAX_ETHNICITY_ROMANIANTax worldlanguages romanianTAX_WORLDLANGUAGES_ROMANIAN