@misc{indiciae17883caf1cba,
  title = {Mineral resource of the month: pumice and pumicite},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2009},
  url = {https://pubs.usgs.gov/publication/70045917},
  note = {Source identifier: 70045917}
}