Published in Manila Phillipine J Sci D, in 1918, in volume 13, pages 233-267

Created: 2013-08-16, modified: 2013-08-16

Published in Philippine Journal of Science, in 1918, in volume 13, issue 2, pages 43-73

Created: 2013-02-27, modified: 2013-02-27

Published in Philippine Journal of Science, in 1918, in volume 13, issue 3, pages 75-126

Created: 2013-02-27, modified: 2013-02-27

Published in Philippine Journal of Science, in 1918, in volume 13, issue 6, pages 281-325

Created: 2014-01-09, modified: 2014-01-09