Download or read book 20,000 Baseball Cards Under the Sea written by Jon Buller and published by Turtleback. This book was released on 1991-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For use in schools and libraries only. Roger's friend Kenneth uses an unusual sea vehicle of his own design to take them to an underwater cave, where a cache of old loot gathered by mermaids contains valuable old baseball cards.