With his book a few weeks out, Jeff Prager discusses the overwhelming evidence pointing to nuclear bombs having been used to destroy the World Trade Center towers on 9/11. The following is the March 19th, 2012 broadcast of The Short End of the Stick, hosted by Mike Harris on the Republic Broadcasting Network.
Here is a link to Jeff Prager’s facebook page, which has links to download documentation of his extensive research in pdf file format.
Here is a link to one of such PDF.
Additionally, he cites this as one of his sources for data:
USGS Environmental Studies of the World Trade Center area after the September 11, 2001 attack.