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| Beattie, John Carruthers, 1866- (1) |
| Geomagnetism (1) |
| Morrison, John Todd, 1863-1944 -- Miscellanea (1) |
| Physicists -- South Africa -- Biography (1) |
| Beattie, John Carruthers, 1866- (1) |
| Geomagnetism (1) |
| Morrison, John Todd, 1863-1944 -- Miscellanea (1) |
| Physicists -- South Africa -- Biography (1) |