@misc{indiciae3029f2238756,
  title = {Aeromagnetic map of the Sidnaw quadrangle, Houghton and Baraga Counties, Michigan},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1967},
  doi = {10.3133/gp601},
  url = {https://pubs.usgs.gov/publication/gp601},
  note = {Source identifier: gp601}
}