@misc{indiciaea816caa140de,
  title = {Geology of the Venezuelan Guayana Shield at 1:500,000 scale; a digital representation of maps published by the U.S. Geological Survey},
  author = {Paul G. Schruben},
  year = {1995},
  doi = {10.3133/ofr95493},
  url = {https://pubs.usgs.gov/publication/ofr95493},
  note = {Source identifier: ofr95493}
}