Published in Philippine J. Sci., in 1919, in volume 14, pages 105-125

Published in Philippine Journal of Science, in 1919, in volume 14, pages 195-199

Published in Phil. Jour. Sci., in 1919, in volume 14, pages 239-250

Published in Philippine Journal of Science, in 1919, in volume 14, pages 287-294

Published in Philippine Journal of Science, in 1919, in volume 14, pages 527-554

Published in Phil. Jour. Sci., in 1919, in volume 14, issue 4, pages 365-457

Published in Philippine Journal of Science, in 1919, in volume 15, pages 9-13

Published in Philippine Journal of Science, in 1919, in volume 15, pages 139-207

Published in Phil. Jour. Sci., in 1919, in volume 15, pages 225-261

Published in Philippine Journal of Science, in 1919, in volume 15, pages 269-281

Published in Philippine Journal of Science, in 1919, in volume 15, pages 385-387

Published in Phil. Jour. Sci., in 1919, in volume 15, pages 539-544

Published in Philippine journal of science, in 1919, in volume 15, issue 1, pages 31-58

Published in Phil. Jour. Sci., in 1919, in volume 15, issue 2, pages 125-137