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Roof framing made easy: a practical ... (etc.)
It is impractical, if even possible to accurately review, or even read this "book" because it cannot be downloaded, but must be read on line, using something named Google Play, instead of the usual method of reading e-books. Google Play is IMPRESSIVELY SLOW AND CLUDGEY, and it took several minutes just to get through the first blank pages. Google Play is a sad mistake for Google, and it seems to me constitutes strong evidence that Google is being self-destructively mismanaged. My recommendation is to not bother with this source, but find a volume that can be downloaded and read as a normal e-book on a Nook or Kindle or PC.