Paperback
(Random House Books for Young Readers, March 20, 1991)
Illus. in full color. Grover can't come over because he's busy working on a secret recycling project. Young readers can unravel the mystery as Grover enlists the help of Elmo, Betty Lou, Bert and Herry to make his idea fly.
Illus. in full color. Grover can't come over because he's busy working on a secret recycling project. Young readers can unravel the mystery as Grover enlists the help of Elmo, Betty Lou, Bert and Herry to make his idea fly.