Figures 7 8 and 9 from: <cite class="book" style="font-style:normal">Day, Archibald (1967)      <i> <a rel="nofollow" class="external text" href="https://archive.org/details/day-hydrographic-service_202111">The Admiralty Hydrographic Service, 1795-1919</a></i>, H.M. Stationery Office  <small><a href="https://en.wikipedia.org/wiki/Online_Computer_Library_Center" class="extiw" title="en:Online Computer Library Center">OCLC</a>:   <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/1082894797">1082894797</a>. </small></cite>
Book author: Archibald Day
1967-12-31
Self-scanned