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Published in Philippine Journal of Science. Manila, in 1919, in volume 15, pages 67-80

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

Published in Philippine Journal of Science. Manila, in 1919, in volume 15, pages 301-305

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

Published in Philippine Journal of Science. Manila, in 1919, in volume 15, pages 521-531

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