I just came across a remarkably in-depth new review of Terry Teachout's fairly recent book on Louis Armstrong by Michael Cogswell. It's in the Journal of Jazz Studies, Vol 8 No 1 Spring 2012. Well worth reading for any old jazz fan.
The entire essay can be reached in PDF format thru a link at Terry Teachout's "About Last Night" blog.
I'm not sure about copyright, or I'd post the whole thing here.