Published in Philippine Journal of Science, in 1923, in volume 22, pages 141-142

Created: 2014-10-30, modified: 2014-10-30

Published in Philippine Journal of Science, in 1923, in volume 22, pages 143-155

Created: 2014-10-30, modified: 2014-10-30

Published in Philippine Journal of Science, in 1923, in volume 22, pages 387-391

Created: 2017-03-02, modified: 2017-03-02

Published in Philippine Journal of Science, in 1923, in volume 22, pages 488-513

Created: 2013-09-18, modified: 2013-09-18

Published in Philippine Journal of Science, in 1923, in volume 23, pages 67-73

Created: 2013-07-29, modified: 2013-07-29