SEM-studies of epidermal patterns of petals in the angiosperms /Author: Christensen, Knud Ib.
Publisher: Copenhagen : Council for Nordic Publications in Botany,
Date: 1998. This title can be found in 1 Iowa libraries.
Revision of Crataegus sect. Crataegus and nothosect. Crataeguineae (Rosaceae-Maloideae) in the Old World /Author: Christensen, Knud Ib.
Publisher: Ann Arbor, Mich. : American Society of Plant Taxonomists,
Date: 1992. This title can be found in 3 Iowa libraries.
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