@misc{indiciae5d93033e0fe8,
  title = {Columbium (Niobium) recycling in the United States in 1998},
  author = {Larry D. Cunningham},
  year = {2004},
  doi = {10.3133/cir1196i},
  url = {https://pubs.usgs.gov/publication/cir1196I},
  note = {Source identifier: cir1196I}
}