Thank you for raising this.
I have been aware for some time of one important series (Snapshots of the beginnings of the Class – which contains an immense amount of important historical information), and I have alerted the Webmaster, and he is working on it. The good news is that the old website still exists, and still hosts the full strings. If I can locate the URL for the old site I will post it as a follow-up, but I don’t have it on the laptop which I am using at the moment.
I was not aware that the problem was more widespread, and I will pass that on!
Oliver