@misc{indiciae6bac21c34d9c,
  title = {The worldwide search for petroleum offshore; a status report for the quarter century, 1947-72},
  author = {Henry L. Berryhill},
  year = {1974},
  doi = {10.3133/cir694},
  url = {https://pubs.usgs.gov/publication/cir694},
  note = {Source identifier: cir694}
}