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The Edison Mystery: A Qwerty Stevens Adventure
Dan Gutman
School & Library Binding (Rebound By Sagebrush, Dec. 1, 2002)FOR USE IN SCHOOLS AND LIBRARIES ONLY. Thirteen-year-old Robert ""Qwerty"" Stevens uses the time machine he finds in his back yard to visit Thomas Edison's workshop in 1879, and there helps develop the electric light bulb, but then needs his sister's help to return to his own time.
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The Edison Mystery : Qwerty Stevens, Back in Time
Dan Gutman, John Ward
Hardcover (Simon & Schuster Children's Publishing, July 1, 2001)Qwerty Stevens's time-traveling adventures take him back to 1879 where he meets the great inventor Thomas Edison as he struggles to perfect his latest creation, the light bulb.
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