@misc{indiciaef00f43f58359,
  title = {Methods of practice and guidelines for using survey-grade global navigation satellite systems (GNSS) to establish vertical datum in the United States Geological Survey},
  author = {Paul H. Rydlund and Brenda K. Densmore},
  year = {2012},
  doi = {10.3133/tm11d1},
  url = {https://pubs.usgs.gov/publication/tm11D1},
  note = {Source identifier: tm11D1}
}