Subject
Stars
12
Navigation
11
Flags
6
History
6
Pilot guides
6
Scientific expeditions
5
Seamanship
5
Compass
4
Description and travel
4
Medals, badges, decorations, etc
3
Arc measures
2
Astronomy
2
British exploration
2
Comets
2
Crimean War, 1853-1856
2
Discovery and exploration
2
English language
2
Geodesy
2
Gyro compass
2
History, Naval
2
Industries
2
Jutland, Battle of, 1916
2
Military uniforms
2
Naval operations
2
Opposition, 1849-1850
2
Parallax
2
Physical education and training
2
Politics and government
2
Polyglot
2
Polyglot glossaries, phrase books, etc
2
Telegraph, Wireless
2
Uniform regulations
2
Uniforms
2
World War, 1914-1918
2
Zoology
2
American exploration
1
Archives
1
Armed Forces
1
Artificers' handbooks
1
Azimuth
1
British
1
Buildings, structures, etc
1
Campaigns
1
Charts
1
Chronometers
1
Climate
1
Coasts
1
Economic conditions
1
Electric welding
1
Electrical engineering
1
more ...