@misc{indiciaec4e26f826966,
  title = {National digital elevation program (NDEP)},
  author = {K. Osborn and J. List and D.B. Gesch and J. Crowe and G. Merrill and E. Constance and J. Mauck and C. Lund and V. Caruso and J. Kosovich},
  year = {2001},
  url = {https://pubs.usgs.gov/publication/70182536},
  note = {Source identifier: 70182536}
}