Six Dr. Seuss books will no longer be published, according to the estate that manages the late author's collection. In a statement, Dr. Seuss Enterprises said, "These books portray people in ways that are hurtful and wrong." The titles include "And to Think That I Saw it on Mulberry Street," "If I Ran the Zoo," "McElligot's Pool," "On Beyond Zebra!" "Scrambled Eggs Super!" and "The Cat's Quizzer." The estate made the announcement on Read Across America Day, which is Dr. Seuss' birthday. "Books teach children who they are in the world and who others are in the world around them," said Ebony Elizabeth Thomas, a children and young adult literature expert who is an associate professor at the University of Pennsylvania.