Reference
How to Know the Ferns and Fern Allies. John T. Mickel. 229 pp. illus. The Pictured Key Nature Series. Wm. C. Brown Company, Dubuque, Iowa, 1979. $5.95 (spiral).
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Cranfill, R. How to know the ferns and fern allies. Econ Bot 34, 390 (1980). https://doi.org/10.1007/BF02858315
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DOI: https://doi.org/10.1007/BF02858315