Published in Phil. Jour. Sci., in 1920, in volume 14, pages 55-69

Published in Philippine Journal of Science, in 1920, in volume 15, issue 1919, pages 445-450

Published in Philippine Journal of Science, in 1920, in volume 16, issue 2, pages 111-144

Published in Philippine Journal of Science, in 1920, in volume 16, issue 3, pages 213-359

Published in Philippine Journal of Science, in 1920, in volume 17, pages 147-202

Published in Philippine Journal of Science, in 1920, in volume 17, pages 221-229

Published in Philippine Journal of Science, in 1920, in volume 17, pages 353-359

Published in Phil. Jour. Sci., in 1920, in volume 17, pages 375-376

Published in Phil. Jour. Sci., in 1920, in volume 17, pages 377-384

Published in The Philippine journal of science, in 1920, in volume 17, pages 489-512

Published in Philippine Journal of Science, in 1920, in volume 17, pages 513-514

Published in Phil. Jour. Sci., in 1920, in volume 17, pages 605-606