http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
new and accurate method of finding a ship's position at sea
by projection on Mercator's chart ... The principles of the method being fully explained and illustrated by problems, examples, and plates, with rules for practice, and examples from actual observation / cby Thomas H. Sumner
88 pages, 6 unnumbered leaves of plates (5 folded) : illustrations, charts, maps ; 25 cm.