@misc{indiciaec90fea144163,
  title = {Magnetic maps of Worcester County and part of Wicomico County, Maryland},
  author = {J. R. Balsley and M.S. Walton and Darwin L. Rossman and J.P. Fitzsimmons and M. E. Hill and W.W. Peters},
  year = {1946},
  doi = {10.3133/om46},
  url = {https://pubs.usgs.gov/publication/om46},
  note = {Source identifier: om46}
}