By accidentally short-circuiting Professor Bullfinch's new crystalline material, Danny Dunn enables the professor to create a new machine that makes Danny invisible.
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Book Description McGraw-Hill. Hardcover. Book Condition: New. 0070705461 New Condition. Bookseller Inventory # NEW6.0025520
Book Description McGraw-Hill, 1974. Hardcover. Book Condition: New. book. Bookseller Inventory # 70705461