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| Leonardo Da Vinci: mortars discharging shells that explode on impact (c.1485 - 88) The Panorama of the Renaissance [p 222] [ISBN 0 500 01727 1] |
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| Leonardo Da Vinci: mortars discharging shells that explode on impact (c.1485 - 88) The Panorama of the Renaissance [p 222] [ISBN 0 500 01727 1] |
