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A letter Blyton wrote to the pupils of the Open Air special school in Barnsley, South Yorks, which had just ordered 12 of her books.
Enchanting photographs of children's author Enid Blyton with the pet dog that inspired many of her early works have come to light.
The black and white photos depict Bobs, Blyton's fox terrier who became a celebrity in his own right after she started writing letters from him in the magazine Teacher's World in 1933.
The signed letter and the picture postcards were sold by International Autograph Auctions of Nottingham for £200.