@misc{indiciae81803b748b8f,
  title = {Updated United Nations Framework Classification for reserves and resources of extractive industries},
  author = {Thomas S. Ahlbrandt and J.R. Blaise and P. Blystad and D. Kelter and G. Gabrielyants and S. Heiberg and A. Martinez and J.G. Ross and S. Slavov and A. Subelj and E.D. Young},
  year = {2004},
  url = {https://pubs.usgs.gov/publication/70026251},
  note = {Source identifier: 70026251}
}