I was obsessed with this book when I was 8 or 9 (so around 1990/1991). I didn't have much success with actually writing GW-BASIC code but I loved reading the manual. I even insisted on reading it aloud to my grandmother, I'm not sure what she made of my doing that.

Not this edition though. An older edition which had a plain cover.

Closer to http://www.bitsavers.org/pdf/microsoft/gw-basic/410130001-32... and http://www.bitsavers.org/pdf/microsoft/gw-basic/410130013-32... bound in the same volume, but I don't think exactly those editions either.

I think the version I had (I seem to have lost it over the decades) was closest to https://hwiegman.home.xs4all.nl/gw-man/ but I can't find a PDF version of that