Here is a serious constructive inquiry or feedback about the Horowitz-Hill _Art of Electronics_ book, for W. Hill or P. Horowitz. I first raised this matter by email but saw no response to date. The issue remains, so I'll try posting it here.
Both the first (1980) and second (1989) edition of the H-H book contain a particular remarkable circuit design, for example Figure 9.73 of the first-edition copy that I've seen (9.90 in the second). This design is a pseudorandom noise generator with programmable spectrum, demonstrating several important electronics principles at once. What I found most striking about it was how closely it resembles the circuit published, if I recall, the year before the first edition, in _Electronic Design_ magazine by Michael Workman of IBM. The latter received an award by that magazine for best design idea of the year (with attendant publicity). This unusual design appears unattributed in both editions of the Horowitz-Hill book that I have seen. I _don't_ know or presume the exact history of the circuit. But whether Workman's appeared first (making it prior art), or the circuit in the book appeared elsewhere before Workman (originating with you, or with some other author), attribution in your book would be widely considered good form, eliminating any conceivable misunderstanding. (Workman, by the way, at my last word, was a vice president at IBM.)
(Again my original effort with this query was private, in a January 2004 email from my IEEE address to W. Hill's email address of record. I later posted a reminder of the email, spelling out the address I'd used, here on SED on February 1 as part of a technical thread in which W. Hill participated. I've seen no response to either.)