Superior series sear themselves

When it comes to series, it's instructive to see most popular by genre but these are the biggest sellers

Title	Author
Harry Potter	J. K. Rowling
Goosebumps	R. L. Stine
Perry Mason	Erle Stanley Gardner
Berenstain Bears	Stan and Jan Berenstain
Choose Your Own Adventure	various authors
Sweet Valley High	Francine Pascal and ghostwriters
Noddy	Enid Blyton
Nancy Drew	various authors as Carolyn Keene
The Railway Series	Rev. W. Awdry, Christopher Awdry
San-Antonio	Frédéric Dard