It was frequently said to be in response to Timothy McVeigh 's Oklahoma bombing .
He had actually used two traditional hard - copy books titled Homemade C - 4 , A Recipe for Survival and Ragnar 's Big Book of Homemade Weapons and Improvised Explosives .
Although it was frequently said to be in response to Timothy McVeigh 's Oklahoma bombing , he had actually used two traditional hard - copy books titled Homemade C - 4 , A Recipe for Survival and Ragnar 's Big Book of Homemade Weapons and Improvised Explosives .