@misc{indiciae2b94ca43d01a,
  title = {Radioisotopic sand tracer study, Point Conception, California : preliminary report on accomplishments, July 1966 - June 1968 — Illustration, Page 57},
  year = {1969},
  url = {https://www.biodiversitylibrary.org/page/32760557},
  note = {Source identifier: page-32760557}
}