There is an edited and expanded edition with an introduction Richard Rhodes available in hard copy http://www.amazon.com/Los-Alamos-Primer-Lectures-Atomic/dp/0...

For the fusion bomb side, recently a book has been written http://www.worldscientific.com/worldscibooks/10.1142/9269 There was some recent controversy regarding what material should be published, the author published it anyway http://www.nytimes.com/2015/03/24/science/hydrogen-bomb-phys...