@misc{indiciae50e373bc3756,
  title = {Notes on a broad-band variant of the NCER seismic data multiplex system for use with field tape recorders},
  author = {Jerry P. Eaton},
  year = {1976},
  doi = {10.3133/ofr7687},
  url = {https://pubs.usgs.gov/publication/ofr7687},
  note = {Source identifier: ofr7687}
}