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At one point, as a technical trainer, I had three versions of the same text, by the same author, with different covers, each in the $70.00 range, and I never found a difference in the text inside, except for a couple of corrections submitted by myself and other trainers in the same area. Luckily for our students, in our technical curriculum, our company provided the texts as part of the tuition, paid by the students' companies.