Published in Nautilus, in 1979, in volume 93, pages 1-10

Published in Nautilus, in 1979, in volume 93, pages 10-14

Published in Nautilus, in 1979, in volume 93, pages 63-69

Published in Nautilus, in 1979, in volume 93, pages 70-73

Published in Nautilus, in 1979, in volume 93, pages 103-105

Published in Nautilus, in 1979, in volume 93, pages 133-135

Published in Nautilus, in 1979, in volume 93, pages 142

Published in Nautilus, in 1979, in volume 93, pages 153-159

Published in Nautilus, in 1979, in volume 93, pages 159-162