http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
162 pages : illustrations, portraits, maps ; 23 cm.
by Rob. E. Fries ; with contributions by K.V. Ossian Dahlgren [and others].
At head of title: Seventh International Botanical Congress, Stockholm, 1950.