Elsie Darrah Morey, 1995. "William C. Darrah’s European experience in 1935: Paleobotanical connections and stratigraphic controversies", Historical Perspective of Early Twentieth Century Carboniferous Paleobotany in North America, Paul C. Lyons, Elsie Darrah Morey, Robert H. Wagner
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William C. Darrah attended both the Sixth International Botanical Congress and the Second International Carboniferous Congress in The Netherlands in 1935. Darrah exchanged ideas with the paleobotanists attending both conferences, and afterwards he was hosted in The Netherlands by W. J. Jongmans and in France by Paul Bertrand. Darrah collected plant megafossils in the coalfields of western Europe and also examined museum collections in The Netherlands and France. The entire experience made a lasting impression on him and set the stage for his interpretations of the stratigraphic paleobotany of the upper Carboniferous rocks of the eastern United States.