I read the book from the library. Great read though can be a bit technical with chemistry.<p>These chemical engineers were really courageous and inquisitive. They have tried so many different combinations to find the right propellant.<p>I would laugh thinking the book is worth more than my iPhone.<p>If I stole the book, I doubt I would find a buyer for the price you see on Amazon but for sure I would be asked to reimburse the library for that price!