Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1921, in volume 73, pages 39-103

Created: 2010-10-26, modified: 2011-06-21

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1921, in volume 73, pages 305-435

Created: 2013-03-02, modified: 2013-03-02

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1921, in volume 73, issue 2, pages 193-304

Created: 2017-03-11, modified: 2017-03-11