Published in Philippine Journal of Science, in 1921, in volume 17, pages 343-351

Created: 2012-05-28, modified: 2017-01-06

Published in Philippine Journal of Science, in 1921, in volume 18, pages 259-288

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

Published in Philippine Journal of Science, in 1921, in volume 18, pages 557-593

Created: 2010-11-21, modified: 2011-06-21

Published in Philippine Journal of Science, in 1921, in volume 18, pages 637-677

Created: 2010-11-21, modified: 2011-06-21

Published in Philippine Journal of Science, in 1921, in volume 18, pages 679-687

Created: 2011-12-10, modified: 2011-12-10

Published in Philippine Journal of Science, in 1921, in volume 18, issue 3, pages 243-257

Created: 2016-08-16, modified: 2016-08-16

Published in Philippine Journal of Science, in 1921, in volume 19, pages 23-63

Created: 2010-11-21, modified: 2023-02-16