  1974 - Childcraft the How and Why Library 1974 [Volume 7: How Things Work] (Hardcover) ISBN-13: 9780738150277 ISBN-10: 0738150274 ?  1974 - Childcraft the How and Why Library 1974 [Volume 8: How We Get Things] (Hardcover) ISBN-13: 9780738150284 ISBN-10: 0738150282 ?    Childcraft the How and Why Library 1974 [Volume 12: Look and Learn] (Hardcover) ISBN-13: 9781373815026 ISBN-10: 1373815027 ? |
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