http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
165 p., [4] leaves of plates : ill. (some col.), maps.
Edition for 1954 published under title: The ferns and fern allies of Minnesota.
Electronic reproduction. Palo Alto, Calif. : ebrary, 2009. Available via World Wide Web. Access may be limited to ebrary affiliated libraries.