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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) |