He worked nights and weekends finding out.
Robertson unearthed 1,000 original World War I
raid reports, and entered each by hand. For World War II,
he scanned roughly 10,000 hand-written or typed pages.
More modern conflicts meant combing a hodgepodge of
I also guess most of the time spent will be spent in interpretation (is this target code consistent with what we know happened from other sources?), not in data entry.
Edit: Fuck it, I'll make something to help normal people do this.
"For the Korean War Robertson found the detailed mission records for the
first 10 months of the three-year conflict but he is still trying to
get his hands on the rest."
Apparently Laos is the most bombed country in the world:
"During the Vietnam War, Laos was the target of the heaviest US bombing campaign since World War II, making Laos the most bombed country in history."
I believe the story is that US B52 bombers would take off out of Thailand to drop their load on Vietnam targets. However, if they bypassed their target they were not allowed to dispose of their load on Vietnam terriroty. Since the bombers can't land with their load on board it has to be disposed of before landing. Apparently Laos was the place of choice. 
Yep that is unfortunately true, and many people there are still suffering from this today. The famed Ho Chi Minh Trail went primarily through eastern Laos as well. It's such a shame, Laos is a wonderful, beautiful country full of good people who were never involved in any conflict.
Wait, how about we have a "hackathon" to figure out ways to stops those bombs from being dropped in the first place! That would be totes awesome!