Published in Nautilus, in 1964, in volume 77, pages 109-110

Published in Nautilus, in 1964, in volume 77, pages 128-131

Published in Nautilus, in 1964, in volume 77, pages 132-134

Published in Nautilus, in 1964, in volume 77, pages 134-139

Published in Nautilus, in 1964, in volume 78, pages 1-3

Published in Nautilus, in 1964, in volume 78, pages 60-62