You seem to echo my opinions, C. Mackinnon. Just because something appears in print, does not necessarily prove it to be factual. I was recently quoted over £1,000 for one such book, with no assurances that I could find the data I seek therein should I buy it. I have hundreds of books, many with conflicting views, so, which one is correct, if any of them. Mentioning the internet is a poor example, as we know that is overladen with mis-information, and the danger here is that folk copy it, pass it on, and before you know they are arguing that is must be true, because "everybody says so". Unless there is a better means to verify details, not relying upon 'expert authors', it can easily become a conspiracy of lies.