Top Ten Rejected Book 7 Titles

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Slow but thorough.  Here are my other nine.

Harry Potter and the Mohorovicic Discontinuity
Harry Potter and the Gall Stone
Harry Potter and the Epistemological Objects
Harry Potter and the Order of Precedence
Harry Potter and the Goblet Cells
Harry Potter and the Half Baked Quince
Harry Potter and the International Association of Fire Chiefs
Harry Potter and Avogadro's Number
Harry Potter and the Subduction Zone (to return to the geological 
motif)

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