While I agree that the 3 books written by others are in a different style, the original poster is correct that there are other foundation books written by Asimov. I am on holiday at present and do not have access to my pbook library, but the count should be at least 7 total. These other books also tie the robot stuff to the foundation stuff. Very nice reads as I recall, but it has been years. Also, books such as "A Pebble in the Sky", "The Currents of Space", and "The Stars Like Dust" were counted by Asimov as being in the Foundation Universe. Corrects welcome as I am doing this mostly from memory.
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