The clue is iron salute in book 1 of The 39 Clues.
The answer to The 39 Clues book 1 page puzzle is "Maggie Powers."
iron solute and phousphrous
You have to read this book, it is the best book in the world! its about these kids who are searching for 39 clues!
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Card #3 comes with the 1st book of the 39 clues:The 39 Clues: Book 1: The Maze of Bonesin the book there are Cards #1, #2, #3, #4, #5, #6.
39. Each book has 1 clue.
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Science Fiction
book 1 maze of bones
Resolution iron solute