Published in Philippine Journal of Science, in 1912, in volume 7, pages 91-95

Created: 2014-02-25, modified: 2014-02-26

Published in Philippine Journal of Science, in 1912, in volume 7, issue 4, pages 241-242

Created: 2012-03-25, modified: 2012-03-25

Published in Philippine Journal of Science, in 1912, in volume 7, issue 5, pages 295-346

Created: 2012-09-29, modified: 2012-09-29

Published in The Philippine journal of science, in 1912, in volume 7D, issue 1, pages 1-64

Created: 2012-12-17, modified: 2012-12-17