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by Henderson, James A.; Twerski, Aaron D.; Kysar, Douglas A.
by Sagan, Scott Douglas; Waltz, Kenneth N.
by Boyce, William E.; DiPrima, Richard C.; Meade, Douglas B.
by Moll, Douglas K.
by Douglas Fisher; Nancy Frey
by Douglas H. Clements, Julie Sarama
by Eder, Douglas
by Kahn, Douglas A.; Kahn, Jeffrey H.
by James A. Henderson, Jr., Douglas A. Kysar
by Marks, Colin P.; Moll, Douglas K.