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I sure wouldn't pay for a 150 day liscence. I buy the book I want it forever. I'd go with paper and the amazon sellers if you can't find it in ebook format. I was a chem major in grad school and I did an awful lot on margin anotation and equation solving in margins for computer versions, paper was really for my purposes better. That was 30 years ago and I still have them in my bookshelf.
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