@misc{indiciae1e3b7af28686,
  title = {Primary productivity by phytoplankton in the tidal, fresh Potomac River, Maryland, May 1980 to August 1981},
  author = {R.R. Cohen and S.O. Pollock},
  year = {1983},
  doi = {10.3133/wri834255},
  url = {https://pubs.usgs.gov/publication/wri834255},
  note = {Source identifier: wri834255}
}