This collection contains materials related to Bill Martin Jr., children’s author and poet. Martin wrote more than three hundred books, including Chicka Chicka Boom Boom, Brown Bear, Brown Bear, What Do You See? and Polar Bear, Polar Bear, What Do You Hear? He often collaborated with his friend and illustrator Eric Carle. Items in this digital collection include photographs, correspondence, and drafts of poems and stories. To view additional items in person, see the Bill Martin Jr. Collection finding aid.