Published in Philippine Journal of Science. Manila, in 1922, in volume 20, pages 111-121

Created: 2011-06-03, modified: 2011-06-21

Published in Philippine Journal of Science. Manila, in 1922, in volume 20, pages 273-278

Created: 2011-06-04, modified: 2011-06-21

Published in Philippine Journal of Science. Manila, in 1922, in volume 20, pages 347-351

Created: 2011-06-03, modified: 2011-06-21