Bertram Boltwood
[de] Bertram Boltwood
[es] Bertram Boltwood
[eu] Bertram Boltwood
[fr] Bertram Boltwood
[it] Bertram Boltwood
[pt] Bertram Boltwood
[ru] Болтвуд, Бертрам
[sv] Bertram Boltwood
[tl] Bertram Boltwood