@misc{indiciae477c504712ef,
  title = {Recent progress in the development of a SPARROW model of sediment for the conterminous U.S.},
  author = {Gregory Schwarz and Richard Smith and Richard Alexander and John Gray},
  year = {2003},
  url = {https://pubs.usgs.gov/publication/70120643},
  note = {Source identifier: 70120643}
}