@misc{indiciae5c671cca2d9f,
  title = {Limestone walls of Okinawa},
  author = {D.E. Flint and Gilbert Corwin and M.G. Dings and W.P. Fuller and F. S. MacNeil and Raymond A. Saplis},
  year = {1953},
  doi = {10.1130/0016-7606(1953)64[1247:lwoo]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70221522},
  note = {Source identifier: 70221522}
}