@misc{indiciae54209fe8ff90,
  title = {The Morris, Minnesota, earthquake of July 9, 1975; aftershock monitoring},
  author = {S.T. Harding and C.J. Langer and G. A. Bollinger and J. C. West and M. Olm},
  year = {1975},
  doi = {10.3133/ofr75423},
  url = {https://pubs.usgs.gov/publication/ofr75423},
  note = {Source identifier: ofr75423}
}