@misc{indiciae50045459b864,
  title = {Chemical analysis of 305 basalt samples from the Columbia River Plateau, Washington, Oregon and Idaho},
  author = {M. R. Brock and Maurice J. Grolier},
  year = {1973},
  doi = {10.3133/ofr7333},
  url = {https://pubs.usgs.gov/publication/ofr7333},
  note = {Source identifier: ofr7333}
}