@misc{indiciae8e03bca645a2,
  title = {Composition and origin of phosphorite deposits of the Blake Plateau},
  author = {Frank T. Manheim and R. M. Pratt and P.F. McFarlin},
  year = {1980},
  url = {https://pubs.usgs.gov/publication/70207342},
  note = {Source identifier: 70207342}
}