Download or read book Undersea, 6, 7 with Buster and Friends. A Counting Adventure written by William Robert Stanek and published by RP Books & Audio. This book was released on 2011-07 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Join Buster and Lass and their new sea horse friends for an undersea counting adventure. Focuses on number sequencing and grouping by 6s and 7s.