Help me save $$$

I have print editions of "Switching to the Mac, the missing manual" for Snow Leopard and Mountain Lion. I am retired and on a budget. Is there an addendum of what is NEW in Mountain Lion only? I would rather purchase that than have a third complete manual. I am old fashioned and prefer to have real books rather than an electronic version when I am trying to find answers.

Thank you,
Lil Lau
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