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