@misc{indiciae5a94349eb484,
  title = {On the origin and age of the Great Sand Dunes, Colorado},
  author = {R.F. Madole and J.H. Romig and J. N. Aleinikoff and D.P. VanSistine and E.Y. Yacob},
  year = {2008},
  doi = {10.1016/j.geomorph.2007.10.006},
  url = {https://pubs.usgs.gov/publication/70031967},
  note = {Source identifier: 70031967}
}