@misc{indiciaec7750b7c856b,
  title = {Descriptions of seismic array components; Part I, Digger, Digitec, and Multiplexer},
  author = {W. H. Lee},
  year = {1992},
  doi = {10.3133/ofr92430b},
  url = {https://pubs.usgs.gov/publication/ofr92430B},
  note = {Source identifier: ofr92430B}
}