@misc{indiciae335a72074c4d,
  title = {The effect of changes in barometric pressure, marine tides, and earth tides on ground-water levels in Puerto Rico},
  author = {R.T. Richards},
  year = {2001},
  url = {https://pubs.usgs.gov/publication/70171498},
  note = {Source identifier: 70171498}
}