@misc{indiciae699881425d51,
  title = {NADM Conceptual Model 1.0 -- A Conceptual Model for Geologic Map Information},
  author = {North American Geologic Map Data Model (NADM) Steering Committee Data Model Design Team},
  year = {2004},
  doi = {10.3133/ofr20041334},
  url = {https://pubs.usgs.gov/publication/ofr20041334},
  note = {Source identifier: ofr20041334}
}