@misc{indiciaefce336984b34,
  title = {Choice of materials most suitable for ballast},
  author = {Leo Maddalena},
  year = {1948},
  doi = {10.3133/ofr4817a},
  url = {https://pubs.usgs.gov/publication/ofr4817A},
  note = {Source identifier: ofr4817A}
}