The Robot's Revenge
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. Original.
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EDITIONS
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    •  
    • Dec-1993
    • Minstrel
    • Paperback
    • ISBN: 0671793136
    • ISBN13: 9780671793135
    •  
    • Jan-1993
    • Turtleback Books
    • Hardcover
    • ISBN: 0606058583
    • ISBN13: 9780606058582
    • Library Binding
    •  
    • Dec-1993
    • Turtleback Books
    • Hardcover
    • ISBN: 0785724222
    • ISBN13: 9780785724223
    • Library Binding



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