What are some good children's series books for a 6yr old boy?

Question: What are some good children's series books for a 6yr old boy!?
Best Answer - Chosen by Asker:

Curious George by Margret & HA Rey
Dr!. Seuss books
George & Martha books by James Marshall
Froggy books by Jonathon London
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The Chronicles of Narnia, by C!. S!. LewisWww@QuestionHome@Com