  1993 - At the Threshold the Developing Adolescent (Paperback) → Hardcover ISBN-13: 9780674050365 ISBN-10: 0674050363 Genres: Health, Fitness & Dieting, Nonfiction 2  1990 - At the Threshold the Developing Adolescent (Hardcover) → Paperback ISBN-13: 9780674050358 ISBN-10: 0674050355 Genres: Health, Fitness & Dieting, Parenting & Relationships ? |
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