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Energy, from Source to Use
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Energy, from Source to Use
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It's entirely possible that they used the same ISBN for both the hardcover and paperback. My dad has a few of these lying around himself (It usually seems to be engineering related stuff).
Krystal109 wrote: "I will leave this to a super who knows more about this."
Much as we sometimes would like it, we supers are not all-knowing. ;)

In this case, it's probably more likely that they just changed the format from one printing to the next. Only the publisher knows for sure (assuming the old guys haven't retired yet).
LCCN 74-78225
On the back of the very last (otherwise blank) page is a series of #s that looks like those related to the printing:
1 2 3 4 5 6 7 8 9 10 -KP- 80 79 78 77 76 75 74


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