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Five on a treasure island. Originally published: 1942
Five go adventuring again. Originally published: 1943
Five run away together. Originally published: 1944.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The Famous Five big book by Enid Blyton. Published by Hodder & Stoughton in 1964. Publication and catalogue information, links to buy online and reader comments.