20,000 baseball cards under the sea /
by Jon Buller and Susan Schade.
- New York : Random House, c1991.
- 47 p. : all col. ill. ; 24 cm.
- Step into reading. A Step 3 book .
- Step into reading. Step 3 book. .
"Grades 2-3"--Cover.
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.