@misc{indiciaeeb151e258871,
  title = {Deformation monitoring at Nevado del Ruiz, Colombia - October 1985 - March 1988},
  author = {N.G. Banks and C. Carvajal and H. Mora and E. Tryggvason},
  year = {1990},
  url = {https://pubs.usgs.gov/publication/70016260},
  note = {Source identifier: 70016260}
}