[pcabc]

Thanks for the link. The data looks like it does in the book! It serves to remind me just how old the book is now. I suppose that when Stan's organisation was maintaining this data, it was for all of his PTR subscribers. It must be a very arduous task for a single individual to maintain.

I've got my own database. It has taken a lot of time to develop and maintain. However, that is how I like to do it. Sensible people would pick a suitable charting service. Jump back 20-30 years and I'm sure that a team of people and a lot of expense would be involved to generate / track similar data.