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

Created: 2017-07-28, modified: 2017-07-28

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

Created: 2010-07-08, modified: 2023-02-16

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

Created: 2010-03-21, modified: 2023-02-16

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

Created: 2010-06-27, modified: 2012-12-18

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

Created: 2010-11-20, modified: 2017-01-06

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

Created: 2015-05-28, modified: 2015-05-28

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

Created: 2010-11-20, modified: 2017-01-06

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

Created: 2017-07-28, modified: 2017-07-28

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

Created: 2017-07-28, modified: 2017-07-28

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

Created: 2012-07-30, modified: 2012-07-30

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

Created: 2015-02-16, modified: 2015-02-16

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

Created: 2017-07-28, modified: 2017-07-28