@misc{indiciae6cb0743b0a18,
  title = {Undiscovered phosphate resources in the Caribbean region and their potential value for agricultural development},
  author = {Richard Porter Sheldon and D.F. Davidson and S.R. Riggs and W. C. Burnett},
  year = {1985},
  doi = {10.3133/cir962},
  url = {https://pubs.usgs.gov/publication/cir962},
  note = {Source identifier: cir962}
}