@misc{indiciaedecd2bec30f9,
  title = {Spectrographic data for the ash of ground birch (Betula rotundifolia Sarg.) leaves and black spruce (Picea mariana B.S.P.) needles collected from the Tanacross 1:250,000-scale quadrangle, Alaska},
  author = {Gordon W. Day and Gary C. Curtin and Theodore M. Billings},
  year = {1979},
  doi = {10.3133/ofr791355},
  url = {https://pubs.usgs.gov/publication/ofr791355},
  note = {Source identifier: ofr791355}
}