@misc{indiciaedfbe7dad0b03,
  title = {Statistics of petroleum exploration in the world outside the United States and Canada through 2015},
  author = {Emil D. Attanasi and Philip A. Freeman},
  year = {2019},
  doi = {10.3133/cir1450},
  url = {https://pubs.usgs.gov/publication/cir1450},
  note = {Source identifier: cir1450}
}