@misc{indiciaeee5f1532d52e,
  title = {Nautical chart manual : practical guidance for cartographers and engineers engaged in constructing and revising nautical charts emphasizing details of current practices as developed by the Coast and Geodetic Survey — Illustration, Page 136},
  year = {1963},
  url = {https://www.biodiversitylibrary.org/page/26988182},
  note = {Source identifier: page-26988182}
}