Published in Philippine Journal of Science, in 1914, in volume 9, pages 285-311

Published in Philippine Journal of Science, in 1914, in volume 9D, pages 57

Published in Philippine Journal of Science, in 1914, in volume 9D, pages 59-81

Published in Philippine Journal of Science, in 1914, in volume 9, pages 269-283

Published in Philippine Journal of Science, in 1914, in volume 8, pages 305-332

Published in Philippine Journal of Science, in 1914, in volume 8, pages 293-299