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Written by E.D. Hirsch, Jr.
Written by Paula Polk Lillard and Lynn Lillard Jessen
Edited by E.D. Hirsch, Jr.
Written by Dr. Joe Brewster, Michele Stephenson and Hilary Beard
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Written by E.D. Hirsch, Jr. and Core Knowledge Foundation
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Edited by Roger Sutton and Martha V. Parravano