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Re:Show HN: I wrote a book about WebAssembly by thanksDr on Friday March 01, 2019 @01:26AM (#19278397)
Yes, the ISBN is what gives it that booky authenticity.
Re:Show HN: I wrote a book about WebAssembly by Stratoscope on Friday March 01, 2019 @05:11AM (#19279243)
FWIW, my second printing of Donald Knuth's Fundamental Algorithms from 1969 lacks an ISBN.

So either it is also not a book, or else OP is in good company.