Published in Nautilus, in 1978, in volume 92, pages 12-14

Published in Nautilus, in 1978, in volume 92, pages 19-20

Published in Nautilus, in 1978, in volume 92, pages 41-54

Published in Nautilus, in 1978, in volume 92, pages 61-67

Published in Nautilus, in 1978, in volume 92, pages 85-88

Published in Nautilus, in 1978, in volume 92, pages 88-91

Published in Nautilus, in 1978, in volume 92, pages 117-123

Published in Nautilus, in 1978, in volume 92, pages 123-125

Published in Nautilus, in 1978, in volume 92, pages 160-167