http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Admiralty manual of hydrographic surveying
Hydrographer of the Navy; to be obtained from agents for the sale of Admiralty charts
Includes "Supplement No. 1 to N.P. 134A" at beginning of v. 2.