Dickerson's Chapel
A ruined church in the northwest, between the Deathclaw Hideout, the WKLM broadcast station, and the Mount Mabel camp. A sniper nicknamed "Tumbleweed" is perched in the church's bell tower, armed with a Reserve Rifle (a unique sniper rifle). There's also a copy of "Guns and Bullets" next to some ammo boxes, a film canister from Oasis, and two Stimpaks hidden under a box of laundry detergent.
A random glitch occasionally occurs, causing the sniper to disappear and never reappear. If you need to get him off the ground, it's best to use a grenade launcher to knock his body off the bell tower. When firing other weapons, it's recommended to aim for the limbs so at least part of the body falls to the ground and can be searched.
Editor's note: aim for the weapon and don't kill the guy. The rifle will fall out of his hands and reappear after a while. This way, you can farm a lot of reservist rifles and repair them, for example.
There's another way to reach the sniper's perch. There's a crate of laundry detergent at the back of the church. Simply slide it under the platform, climb onto the crate, and then you'll be able to reach the sniper's body to loot the trophies.
Mount Mabel Camp
Located southwest of Dickerson's Oratory, it features several campers and picnic tables. Raiders can sometimes be found in the camp, while other times the area is completely abandoned. Ammunition, medical supplies, and weapon crafting parts can be found in the area.
Source: stopgame.ru, Orcidea
See also:
Canterbury Commons (and Superheroes)
, Fallout 3: Arlington Library,
Fallout 3: Herdershade and Rockopolis.