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February 20
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1894, in volume 46, pages 61
March 27
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1894, in volume 46, pages 95
April 3
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1894, in volume 46, pages 110
July 10
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1894, in volume 46, pages 207
August 28
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1894, in volume 46, pages 222
October 30
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1894, in volume 46, pages 291
November 27
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1894, in volume 46, pages 417-418