Published in Nautilus, in 1976, in volume 90, pages 41-46

Published in Nautilus, in 1976, in volume 90, pages 46-49

Published in Nautilus, in 1976, in volume 90, pages 49-52

Published in Nautilus, in 1976, in volume 90, pages 63-64

Published in Nautilus, in 1976, in volume 90, pages 70-73

Published in Nautilus, in 1976, in volume 90, pages 86-88

Published in Nautilus, in 1976, in volume 90, pages 94-98

Published in Nautilus, in 1976, in volume 90, pages 99-100

Published in Nautilus, in 1976, in volume 90, pages 125

Published in The Nautilus, in 1976, in volume 90, issue 1, pages 15-23

Published in The Nautilus, in 1976, in volume 90, issue 1, pages 25-36

Published in Nautilus, in 1976, in volume 90, issue 4, pages 127-138