@misc{indiciae47e065bc6236,
  title = {Sand waves, bars, and wind-blown sands of the Rio Orinoco, Venezuela and Colombia},
  author = {Carl F. Nordin and David Perez-Hernandez},
  year = {1989},
  doi = {10.3133/wsp2326a},
  url = {https://pubs.usgs.gov/publication/wsp2326A},
  note = {Source identifier: wsp2326A}
}