@misc{indiciaec98d0d0ed15d,
  title = {Ocean acidification postcards},
  author = {Heather A. Schreppel and Matthew J. Cimitile},
  year = {2011},
  doi = {10.3133/gip122},
  url = {https://pubs.usgs.gov/publication/gip122},
  note = {Source identifier: gip122}
}