I found this while playing around Pinterest this morning:

List of Dr. Seuss books organized by reading level by Montessori Tidbits. Dr. Seuss and I Can Read By Myself books are still some of the best books to teach rhyming, sight words and other important early reading skills. While reading these books to toddlers is great because they get to hear rhythm and rhyming, this list is a fabulous resource for teachers who have little ones who are ready to tackle these books on their own.