Arthur's Birthday (An Arthur Adventure) Paperback – Picture Book, April 1, 1991 by Marc Brown
 
Arthur can't wait to hand out his birthday party invitations. But it turns out Muffy is having her party on the exact same day! All of his friends are split between the two parties so Arthur and Francine hatch a clever scheme to make sure Arthur and Muffy have the best birthdays yet!
 
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