Published in Nautilus, in 1971, in volume 84, pages 82-83

Published in Nautilus, in 1971, in volume 84, pages 84-86

Published in Nautilus, in 1971, in volume 84, pages 93-96

Published in Nautilus, in 1971, in volume 84, pages 101-117

Published in Nautilus Philad, in 1971, in volume 84, pages 107-109

Published in Nautilus, in 1971, in volume 84, pages 120-127

Published in Nautilus, in 1971, in volume 85, pages 12-17

Published in Nautilus Philad, in 1971, in volume 85, pages 20-26

Published in The Nautilus, in 1971, in volume 85, issue 2, pages 49-51