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by Gehring, Verna V.; Levinson, Meira; Galston, William A.; et al.
by Gehring, Wes D.
by Gehring,Abigail R.
by Gehring, Verna V.; Galston, William; Crocker, David A.; et al.
by Gehring, Ulrike
by Edited by Abigail R. Gehring
by Edited with an introduction by Abigail R. Gehring