At the very least, it does obsolete jobs. The more accurate question to be asking would be whether tech or the economy create enough other jobs to come fill in those gaps.

Is the Washington Post good enough?

They have a link to the slide deck of a Federal Reserve about what was lossed and what was gained. Sadly, it didn't display in my browser.

http://www.washingtonpost.com/blogs/wonkblog/wp/2013/02/28/h...