@misc{indiciae549be79d3ea6,
  title = {Gravity map of the Trinidad quadrangle, Colorado: A contribution to the Upper Mantle Project},
  author = {D. L. Peterson and Peter Popenoe and J. R. Gaca and D. E. Karig},
  year = {1968},
  doi = {10.3133/gp638},
  url = {https://pubs.usgs.gov/publication/gp638},
  note = {Source identifier: gp638}
}