Published in Nautilus, in 1977, in volume 91, pages 72-73

Published in Nautilus, in 1977, in volume 91, pages 77-80

Published in Nautilus, in 1977, in volume 91, pages 87-88

Published in Nautilus, in 1977, in volume 91, pages 89-91

Published in Nautilus, in 1977, in volume 91, pages 119-128

Published in Nautilus, in 1977, in volume 91, pages 128-130

Published in Nautilus, in 1977, in volume 91, pages 143-145

Published in Nautilus, in 1977, in volume 91, issue 4, pages 130-133

Published in The Nautilus, in 1977, in volume 91, issue 4, pages 146-148

Published in The Nautilus, in 1977, in volume 91, issue 4, pages 149-155