@misc{indiciaecd21b7c46e7c,
  title = {Statistical data on glacial boulders},
  author = {Gerald A. Waring},
  year = {1949},
  doi = {10.1126/science.109.2829.283},
  url = {https://pubs.usgs.gov/publication/70010865},
  note = {Source identifier: 70010865}
}