BioStor
Cystopteris fragilis (L.) Bernh.
 | A list of the ferns and fern allies of North America north of Mexico, with principal synonyms and distribution William R Maxon (1901) Proceedings of The United States National Museum 23: 619-651 |
 | The Life-Areas of Southern New Jersey Witmer Stone (1907) Proceedings of The Academy of Natural Sciences of Philadelphia 59: 452-460 |
 | Some Alaska Peninsula Bird Notes Charles A Gianini (1917) The Auk 34: 394-402 |
 | Observations on the Soil Acidity of Ericaceae and Associated Plants in the Middle Atlantic States Edgar T Wherry (1920) Proceedings of The Academy of Natural Sciences of Philadelphia 72: 84-111 |
 | Seventh supplement to the flora of the District of Columbia and vicinity W L Mcatee (1930) Proceedings of The Biological Society of Washington 43: 21-54 |
 | Eighth supplement to the flora of the District of Columbia and vicinity W L Mcatee (1940) Proceedings of The Biological Society of Washington 53: 135-154 |