more than 60 books
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He published 44 Children's Books under the pen name Dr. Seuss. From those, there have been more than a half a billion copies sold.
He published other books and works (not all for children) using other pen names. I don't know the numbers for those.
Over 600 million copies of Dr. Seuss books have been sold worldwide. His books continue to be popular and have been translated into multiple languages.
Over 200 million copies
3 adults books and 44 children's books
49
Neil Gaiman's books have collectively sold over 10 million copies worldwide.
well Over 85,000,000 Million books have been sold
42 million have been sold
3 have been sold
80000000
200
3
Approximately over 73 million copies of the book have been sold.
Fifteen Clique Books have been published.
total number of books been sold on isbn 1432709976 by leon butler?
Over 3 million copies of Tracy Beaker books have been sold in the UK.
17 million copies have been sold