Here is a comparison of my books. The original Engine Design and Blueprint Assy. book with the plastic binding I purchased in the 1970's, can't remember for sure but seems like early to mid 70's. The Parts and Specs book shown was purchased much later because I think my original was ripped off, but that's another story.
Anyway, the originals looked like they were typed with double spacing and all that. The newer copies appear to have been done with a computer program.
Hope this helps.
Dean
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