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by Berg, J. H. Van Den; Jager, Bernd; Jager, David; et al.
by David Berg
by Berg, David; Marks, Robert; Eckmann, David; et al.
by Berg, David M.; Marks, Robert
by Berg, David; Marks, Robert
by Berg, Janine; Kucera, David
by Raven, Peter H.; Berg, Linda R.; Hassenzahl, David M.
by Peter H. Raven (Missouri Botanical Garden); Linda R. Berg (Former Affiliations: University of Maryland, College Park St. Petersburg College ); David M. Hassenzahl (University of Nevada, Las Vegas)
University of Maryland, College Park
St. Petersburg College
)
by Berg, David