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January 6, 1880
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 9
Carcinological Notes No. I
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 34-37
March 23
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 134
June 29
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 226-228
A New Locality for Siderite
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 242
Epidote in Molybdenite
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 243
On Dendrites
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 278-279
On a Jurassic Sand
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 279
A New Locality for Lignite
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 281
On Large Sphene from Canada
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 341
September 28
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 351
On Fresh-Water Sponges
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 356-357
December 14
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 359
Elections during 1880
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 428