@misc{indiciaed44ea1af1caa,
  title = {Observatories, program in USA},
  author = {Jeffrey J. Love and J.B. Townshend},
  year = {2007},
  doi = {10.1007/978-1-4020-4423-6\_231},
  url = {https://pubs.usgs.gov/publication/70200684},
  note = {Source identifier: 70200684}
}