Published in Nautilus, in 1983, in volume 97, pages 23-26

Published in Nautilus, in 1983, in volume 97, pages 28-29

Published in Nautilus, in 1983, in volume 97, pages 30-35

Published in Nautilus, in 1983, in volume 97, pages 69-72

Published in Nautilus, in 1983, in volume 97, pages 125-128

Published in Nautilus, in 1983, in volume 97, pages 135-138

Published in Nautilus, in 1983, in volume 97, pages 138-144