Title: 20,000 baseball cards under the sea
First published: 1991
Description: 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 the mermaids turns out to contain a lot of very valuable old baseball cards.
Subjects: Fiction, Juvenile fiction, Baseball cards, Inventors, Buried treasure, Treasure-trove, Inventors -- Fiction, Buried treasure -- Fiction, Baseball cards -- Fiction, Beginner, JUVENILE FICTION, Fantasy & Magic, Baseball & Softball, Sports & Recreation, Reader, Baseball, fiction, Buried treasure, fiction, Inventions, fiction, Children's fiction