TY  - RPRT
TI  - World conventional crude oil and natural gas: Identified reserves, undiscovered resources and futures
AU  - C.D. Masters
AU  - D. H. Root
AU  - R. M. Turner
PY  - 1998
DO  - 10.3133/ofr98468
UR  - https://pubs.usgs.gov/publication/ofr98468
ID  - ofr98468
ER  -