@misc{indiciae9247052ebdec,
  title = {History of dredging and filling of lagoons in the San Juan area, Puerto Rico},
  author = {S. R. Ellis},
  year = {1976},
  doi = {10.3133/wri7638},
  url = {https://pubs.usgs.gov/publication/wri7638},
  note = {Source identifier: wri7638}
}