Published in Philippine Journal of Science, in 1914, in volume 8, pages 293-299

Created: 2017-10-11, modified: 2017-10-11

Published in Philippine Journal of Science, in 1914, in volume 8, pages 305-332

Created: 2017-10-11, modified: 2017-10-11

Published in Philippine Journal of Science, in 1914, in volume 9, pages 269-283

Created: 2017-09-20, modified: 2017-09-20

Published in Philippine Journal of Science, in 1914, in volume 9, pages 285-311

Created: 2012-05-28, modified: 2016-08-11

Published in Philippine Journal of Science, in 1914, in volume 9D, pages 57

Created: 2014-10-18, modified: 2014-10-18

Published in Philippine Journal of Science, in 1914, in volume 9D, pages 59-81

Created: 2014-10-18, modified: 2014-10-18