The Valley of Adventure and the Sea of Adventure: Two Great Adventures (Adventure Series) in Paperback format by Blyton, Enid. Published by MACMILLAN in 2002. Available in Used - Very Good condition.
Enid Mary Blyton was a British children's writer known as both Enid Blyton and Mary Pollock. She was one of the most successful children's storytellers of the twentieth century.[1][1]
[1]: http://en.wikipedia.org/wiki/Enid_Blyton