@misc{indiciae0a8182bfcc22,
  title = {Improvements in magnetic observatory construction and operation in permafrost areas},
  author = {John B. Townshend},
  year = {1978},
  doi = {10.3133/ofr78213},
  url = {https://pubs.usgs.gov/publication/ofr78213},
  note = {Source identifier: ofr78213}
}