Published in Manila Phillipine J Sci D, in 1918, in volume 13, pages 233-267

Published in Philippine Journal of Science, in 1918, in volume 13, issue 2, pages 43-73

Published in Philippine Journal of Science, in 1918, in volume 13, issue 3, pages 75-126

Published in Philippine Journal of Science, in 1918, in volume 13, issue 6, pages 281-325