@misc{indiciaee8a3e5649b25,
  title = {Geology and mineral resource assessment 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 and J. C. Wynn and Floyd Gray and D. P. Cox and J.H. Sterwart and W. E. Brooks},
  year = {1997},
  doi = {10.3133/ds46},
  url = {https://pubs.usgs.gov/publication/ds46},
  note = {Source identifier: ds46}
}