What Millie and Maud, two cool cows from the Huckabuck farm, decide to do some late-night jumping to the far side of the moon, the Huckabuck kids chase after, wondering if they'll ever see their new black button-back boots again!

Two Cool Cows 1997, Puffin Books

ISBN-13: 9780698115996

Trade paperback

Two Cool Cows 1995, Putnam Publishing Group, New York, NY

ISBN-13: 9780399226472