@misc{indiciae255f047cc4d7,
  title = {A topological system for delineation and codification of the Earth's river basins},
  author = {K.L. Verdin and J. P. Verdin},
  year = {1999},
  doi = {10.1016/s0022-1694(99)00011-6},
  url = {https://pubs.usgs.gov/publication/70021659},
  note = {Source identifier: 70021659}
}