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Wallace. (EN) Matthew S. Wallace, Forest Health Technology Enterprise Team, Morgantown, West Virginia, A historical review of Adelgid Nomenclature (PDF), Third Symposium on Hemlock Woolly Adelgid in the Eastern United States, Ascheville, North Carolina, February 1-3, 2005, pp. 7-14. URL consultato l'8 ottobre 2008 (archiviato dall'url originale il 25 ottobre 2007).