http://www.google.com/googlebooks/uspto-patents.html

I spent an hour trying to find this back. So, I'm placing it here http://www.washingtonpost.com/blogs/worldviews/wp/2013/07/16/the-amazing-surprising-africa-driven-demographic-future-of-the-earth-in-9-charts/ and along those lines:

• http://www.registerguard.com/rg/opinion/30156138-78/population-million-africa-billion-2100.html.csp
• http://beta.fool.com/whichstockswork/2013/05/30/targeting-africa-as-the-new-china/35532/
• http://alephblog.com/2012/11/29/on-human-fertility-part-2/
• http://www.heritage.org/research/lecture/2013/02/unleashing-the-us-investor-in-africa
• http://www.businessinsider.com/analyst-world-population-will-peak-at-85-billion-in-2030-2012-11

After visiting the Farnsworth house, this post makes me happy http://www.oobject.com/category/12-buildings-inspired-by-the-farnsworth-house/ adding a "steel house" section to my checklist.