@misc{indiciae781521fe4289,
  title = {Ancient geomagnetic field intensities—I Historic and archaeological data: Sets H1–H9},
  author = {Peter J. Smith},
  year = {1967},
  doi = {10.1111/j.1365-246x.1967.tb03140.x},
  url = {https://pubs.usgs.gov/publication/70210846},
  note = {Source identifier: 70210846}
}