while looking for other sources of the same document, I found this:
http://www.pearl-hifi.com/06_Lit_Archive/

On Sun, Mar 12, 2017 at 8:43 AM, RussellMc <apptechnz@gmail.com> wrote:
>> Two can play at that game, here is volume 1:
>>
>> https://doc.xdevs.com/doc/_Lab/FOCUSON_BobPeaseAnalog.pdf
>>
>>
>
> WOW!
> And the rest ...
>
>                       https://doc.xdevs.com/doc/_Lab/
>
> legitimate?
>
> _______________________
>
> Q: Does anyone know how legitimate these are?
> Penton are giving them away gradually at price of free + your_soul.
> Bob is of course not of Penton derivation, but they may have obtained
> rights to do this - or may be giving away material that is free to garner
> registrations (good trick if you can manage it).
>
> SOME of the material on the xdevs site appears illegitimate.
> eg an ebook that loudly says it is a single use copy that may not be copi=
ed
> ....
> Plus various books with the standard copyright sections and no indication=
s
> thatthis version is made available at no cost. '
>
>
>
>          Russell
>
>
> --
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