The anti-material rifle is like a upgraded version of the sniper rifle, but is not the unique one. I found many from dead legionarries at Hoover Dam. They can be found all across from a variety of people around the Mojave Wasteland. I think I remember finding on at Nellis AFB.
The Anti-Material Rifle can also be bought by the gun runners when you are a high enough level. But a SPECIAL sniper rifle that is GOLD is the Gobi Campaign Scouting Rifle. It is found at the `Sniper`s Nest`which is just a little north east of Cottonwood Cove. But you MUST have a lockpick skill of 100 to get it as it is in a very hard locked footlocker
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go to games for windows find the fallout 3 dlc buy it and you will have it
Rivit City
There lots of broken pipes in Fallout 3... mind you 200 years ago there was a nuclear war, so a lot of pipes broke. You can find quite a lot in abandoned metro stations.
There vaults a pretty much in the same section as each other, just spread out a bit.
You will find Wild Bills' corpse in the scrapyard in the dlc "The Pitt". It should be up the flight of stairs in the back left area from where you were facing when you enter said area.