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by Jane Gildart; Bert Gildart
by Bert Gildart; Jane Gildart
by Gildart, Bert; Gildart, Jane; Heerdt, Marcus
by Barbara Tomovick and Kimberly Metz; revised and updated by Bert and Jane Gildart
by Bert and Jane Gildart
by Gildart, Bert; Gildart, Jane
by T. D. Griffith, Dustin D. Floyd, Bert Gildart, and Jane Gildart