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Book Overview
While attending the Teen Inventors Club competition in Chicago, Frank and Joe Hardy discover that someone is trying to sabotage Roger the Lobber, an automatic tennis ball retrieval and return unit. This description may be from another edition of this product.
Format:Paperback
Language:English
ISBN:0671793136
ISBN13:9780671793135
Release Date:December 1993
Publisher:Aladdin Paperbacks
Length:10 Pages
Weight:0.27 lbs.
Dimensions:0.4" x 5.1" x 7.5"
Age Range:9 to 12 years
Grade Range:Grades 4 to 7
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