Published in Nautilis, in 1931, in volume 44, pages 73-75

Published in Nautilis, in 1931, in volume 44, pages 75-77

Published in Nautilis, in 1931, in volume 44, pages 84-85

Published in Nautilis, in 1931, in volume 44, pages 87-91

Published in Nautilis, in 1931, in volume 44, pages 94-95

Published in Nautilis, in 1931, in volume 44, pages 95-96

Published in Nautilus, in 1931, in volume 44, pages 109-113

Published in Nautilus, in 1931, in volume 44, pages 113-114

Published in Nautilis, in 1931, in volume 44, pages 115-119

Published in Nautilis, in 1931, in volume 44, pages 119-121

Published in Nautilis, in 1931, in volume 44, pages 121-122

Published in Nautilis, in 1931, in volume 44, pages 122-123

Published in Nautilis, in 1931, in volume 44, pages 127-130

Published in Nautilis, in 1931, in volume 44, pages 131-137

Published in Nautilis, in 1931, in volume 44, pages 138-140

Published in Nautilis, in 1931, in volume 45, pages 6-10

Published in Nautilis, in 1931, in volume 45, pages 10-16

Published in Nautilis, in 1931, in volume 45, pages 16-20

Published in Nautilus, in 1931, in volume 45, pages 20-21

Published in Nautilis, in 1931, in volume 45, pages 21-25

Published in Nautilis, in 1931, in volume 45, pages 25-27

Published in Nautilis, in 1931, in volume 45, pages 37-41

Published in Nautilis, in 1931, in volume 45, pages 41-47

Published in Nautilus, in 1931, in volume 45, pages 47-51

Published in Nautilis, in 1931, in volume 45, pages 51-52

Published in Nautilus, in 1931, in volume 45, pages 53-55

Published in Nautilis, in 1931, in volume 45, pages 55-58

Published in Nautilis, in 1931, in volume 45, pages 67-68

Published in Nautilis, in 1931, in volume 45, pages 70-71