@misc{indiciaecfae161e89ef,
  title = {The superior analyses of igneous rocks from Roth's Tabellen, 1869 to 1884, arranged according to the quantitative system of classification},
  author = {H.S. Washington},
  year = {1904},
  doi = {10.3133/pp28},
  url = {https://pubs.usgs.gov/publication/pp28},
  note = {Source identifier: pp28}
}