@misc{indiciaecedddf78f08a,
  title = {Petrology of fluvial sands from the Amazonian foreland basin, Peru and Bolivia: Discussion},
  author = {Mark J. Johnsson and Robert F. Stallard and N. Lundberg},
  year = {1990},
  url = {https://pubs.usgs.gov/publication/70242820},
  note = {Source identifier: 70242820}
}