@misc{indiciaedc76fefd79d4,
  title = {Use of a bubble tiltmeter as a horizontal seismometer},
  author = {Miller, W. F. and Geller, R. J. and Stein, S.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780066607},
  note = {Source identifier: 19780066607}
}