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Used availability for Robert Arthur's The Secret of Skeleton Island
Hardback Editions
September 1985 : USA Library Binding

Title: Secret of Skeleton Island (Three Investigators)
Author(s): Robert Arthur, Alfred Hitchcock
ISBN: 0-613-12094-9 / 978-0-613-12094-4 (USA edition)
Publisher: Turtleback Books
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Amazon Amazon UK Amazon CA Amazon AU September 1966 : USA Library Binding

Title: Alfred Hitchcock and the Three Investigators in the Secret of Skeleton Island
Author(s): Robert Arthur
ISBN: 0-394-91552-6 / 978-0-394-91552-4 (USA edition)
Publisher: Random House
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January 1985 : USA Paperback

Title: Secret of Skeleton Island
Author(s): Robert Arthur
ISBN: 0-606-21808-4 / 978-0-606-21808-5 (USA edition)
Publisher: Demco Media
Availability:
Amazon Amazon UK Amazon CA September 1985 : USA Paperback

Title: The Secret of Skeleton Island (Three Investigators Classics, No. 6)
Author(s): Robert Arthur
ISBN: 0-394-86406-9 / 978-0-394-86406-8 (USA edition)
Publisher: Random House Books for Young Readers
Availability:
Amazon Amazon UK Amazon CA April 1988 : UK Paperback
Title: Secret of Skeleton Island (Three Investigators Mystery S.)
Author(s): Robert Arthur
ISBN: 0-00-692668-1 / 978-0-00-692668-9 (UK edition)
Publisher: Armada
Availability:
Amazon Amazon UK August 1966 : USA Paperback

Title: The Secret of Skeleton Island (Three Investigators)
Author(s): Robert Arthur
ISBN: 0-394-81552-1 / 978-0-394-81552-7 (USA edition)
Publisher: Random House Books for Young Readers
Availability:
Amazon Amazon UK Amazon CA Amazon AU June 1978 : USA Paperback

Title: Secret of Skeleton Island
Author(s): Robert Arthur
ISBN: 0-590-30325-2 / 978-0-590-30325-5 (USA edition)
Publisher: Scholastic Paperbacks
Availability:
Amazon Amazon UK Amazon CA May 1978 : USA Paperback

Title: Alfred Hitchcock and The Three Investigators in The Secret of Skeleton Island
Author(s): Robert Arthur
ISBN: 0-394-83769-X / 978-0-394-83769-7 (USA edition)
Publisher: Random House Books for Young Readers
Availability:
Amazon Amazon UK Amazon CA July 1970 : UK Paperback

Title: Secret of Skeleton Island (Armada)
Author(s): Robert Arthur
ISBN: 0-00-690341-X / 978-0-00-690341-3 (UK edition)
Publisher: HarperCollins Distribution Services
Availability:
Amazon Amazon UK Amazon CA May 1972 : UK Paperback

Title: The Secret of Skeleton Island (Alfred Hitchcock Books)
Author(s): Robert Arthur
ISBN: 0-00-160004-4 / 978-0-00-160004-1 (UK edition)
Publisher: Collins
Availability:
Amazon UK Amazon CA October 1968 : UK Paperback

Title: Alfred Hitchcock and The Three Investigators in The Secret of Skeleton Island
Author(s): Robert Arthur
ISBN: 0-00-160149-0 / 978-0-00-160149-9 (UK edition)
Publisher: Collins
Availability:
Amazon Amazon UK