Berkeley has an institutional lisence I didn't pay anything to view it.
And us poor schleps on the outside get left in the dark.
No wonder you are finding things that I couldn't find.
I'm afriad my money is better spent buying another book on the periodic table in general than answering a trivia question for one element. Validating all data on my table is much more important than posting a little bit of trivia about one element.
What is really killing me is that I can't find multiple offline sources that contain cross section data. I found one source about seven years ago, but never found a second book that contained this information and over the years some questions have been raised about the accuracy of my data. I finally pulled this data point from my element pages until I can find new sources to validate my information.
I swear that some times I can have three different "reliable" printed sources all showing a different figure for a single data point.
I figure twenty years from now someone will still find a data error on my periodic table or claim that their source shows a different figure and I'll have to break out all 6E6 books and charts I'll have on the subject and have to do some kind of statistical analysis to figure out what the best answer is.