"zxcv" wrote in message
...
Since the Hiroshima and Nagasaki bombs were about 10 kilotons and a B-17
had
a normal bomb load of about 3 tons and I have heard of a formation of 1300
B-17's on a bomb run that would equal around 4 kilotons (3 x 1300 = 3900)
would the devastation be the same as a small A-bomb? or is there some
lessening effect because of the spread of much smaller bombs?

Yes.