Once Upon A Nursery Rhyme THE MAILBOXr Books Use your students' favorite nursery rhymes to reinforce skills in literacy, math, and other core Early Childhood areas! Each nursery rhyme unit comes complete with a color rhyme poster, color rhyme characters, and developmentally appropriate activities and reproducibles for cross-curricular learning. Preschool-Kindergarten. 128 pages. Each nursery rhyme unit contains Theme-based activities to boost skills any time of year Popular rhymes like Humpty Dumpty, Jack and Jill, Little Bo Peep, and more!