"Ground Zero" simulator
Software based on Google's Maps framework and a bit of Javascript, gives impression
on effects of a nuclear attack of any given point.
Effects of Nuclear Weapons published by the US Government is by far the most authoritive official unclassified
source. Most other sources are based on compilations from this book.
Though out-of-print, different editions (1962, 1964, 1977) are still available from
Amazon, eBay etc.
On-line version is available as PDF files (scanned book chapters).
These 2 documents were issued by the Canadian government.
Both are based on "Effects of Nuclear Weapons".
Courtesy Bruce Beach, Radiological Scientific Officer, Canada.