@misc{indiciae876683fd6251,
  title = {Maps showing distribution and abundance of niobium in geochemical samples from the Bradfield Canal quadrangle, southeastern Alaska},
  author = {R. D. Koch and Raymond L. Elliott},
  year = {1981},
  doi = {10.3133/ofr81728j},
  url = {https://pubs.usgs.gov/publication/ofr81728J},
  note = {Source identifier: ofr81728J}
}