Subject
Ireland
304
Lighthouses
222
Lightships
66
Astronomy
14
Lighthouse keepers
11
Harbors
9
Sports
5
Fishing boats
4
Coastlines
3
Mechanics
3
Screws, Theory of
3
Astronomers
2
Stars
2
Warships
2
Autographs
1
Disability
1
Dynamics
1
Equations, Biquadratic
1
Geometry
1
Glacial epoch
1
History
1
Irish
1
Lectures and lecturing
1
Mathematicians
1
Nebular hypothesis
1
Observatory
1
Scientific expeditions
1
Spherical astronomy
1
Tides
1