I Google, therefore I find…maybe: Obvious and not so obvious ways to narrow down (
•1. Simple Google search on “terrorism” (9/20/04 = 9,540,000 hits;;4/27/05 = 43,700,00 0 hits; 9/17/06 = 118,000,000)
•2. Advanced Google search using “terrorism” and format .pdf (9/20/04 = 607,000 hits;; 4/27/05 = 1,750,000; 9/17/06 = 13,200,000)
•3. Advanced Google search using “terrorism” and domain suffix  .edu (9/20/04 = 653,000 hits;  4/27/05 = 1,830,000; 9/17/06 = 12,200,000)