@misc{indiciaeab0b2408a191,
  title = {Reflectivity measurements with a hallimond visual microphotometer},
  author = {Benjamin F. Leonard},
  year = {1960},
  doi = {10.2113/gsecongeo.55.6.1306},
  url = {https://pubs.usgs.gov/publication/70220521},
  note = {Source identifier: 70220521}
}