@misc{indiciae1aaf2818babf,
  title = {A study of buried bedrock valleys near South Haven, Michigan, by the gravity method},
  author = {J. S. Klasner},
  year = {1964},
  doi = {10.3133/ofr6499},
  url = {https://pubs.usgs.gov/publication/ofr6499},
  note = {Source identifier: ofr6499}
}