@misc{indiciaefd382514430b,
  title = {Columbium (niobium) recycling in the United States in 1998},
  author = {Larry D. Cunningham},
  year = {2001},
  doi = {10.3133/ofr01348},
  url = {https://pubs.usgs.gov/publication/ofr01348},
  note = {Source identifier: ofr01348}
}