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2. The Slyrax of northern California and the relationships of the Styracaceae;Copeland;American Journal of Botany,1938
3. Further studies on Monotropoideae;Copeland;Madroño,1941
4. A study, anatomical and taxonomic, of the genera of Rhododendroideae;Copeland;American Midland Naturalist,1943
5. Observations on the structure and classification of the Pyroleae;Copeland;Madroño,1947