@misc{indiciaec17870a06815,
  title = {A further contribution to the petrology of Haleakala volcano, Hawaii},
  author = {G. A. Macdonald and H. A. Powers},
  year = {1968},
  doi = {10.1130/0016-7606(1968)79[877:afcttp]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70221431},
  note = {Source identifier: 70221431}
}