- Ulmaceae - From "The Families of Flowering Plants." Description of this family of trees and shrubs, including anatomy and morphology, physiology and biochemistry, geography, and economic uses.
www.keil.ukans.edu/delta/angio/www/ulmaceae.htm
- Ulmaceae - The Elm Family - Brief illustrated description of this family of woody plants, mostly trees, found primarily in northern, temperate regions.
www.csdl.tamu.edu/FLORA/Wilson/tfp/ham/ulmpage2.htm
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