Published in Nautilus, in 1962, in volume 75, pages 102-107

Published in Nautilus, in 1962, in volume 75, pages 116-121

Published in Nautilus, in 1962, in volume 75, pages 165-166

Published in Nautilus, in 1962, in volume 76, pages 1-7

Published in Nautilus, in 1962, in volume 76, pages 16-22

Published in Nautilus, in 1962, in volume 76, pages 23-25

Published in Nautilus, in 1962, in volume 76, pages 39-44