Studies of tropical American ferns - no. 6.
Maxon, William R.
Studies of tropical American ferns - no. 6. - Washington Govt. print. off. 1916. - 541-608, viii p. ill. 24 cm. - Contributions from the United States National Herbarium / Smithsonian Institution. United States National Museum v.17, pt.7 . - United States National Museum. Contributions from the United States National Herbarium v.17, pt. 7. .
Studies of tropical American ferns - no. 6. - Washington Govt. print. off. 1916. - 541-608, viii p. ill. 24 cm. - Contributions from the United States National Herbarium / Smithsonian Institution. United States National Museum v.17, pt.7 . - United States National Museum. Contributions from the United States National Herbarium v.17, pt. 7. .