Sadly you cannot get anymore ammo for the weapon anywhere else in tho mojave or surrounding areas :(
from the crashed alien ship next to the dead alien
It isn't as much the Gauss Blaster as it is The Gauss Rifle.It is obtained after Downloading the Extra content of the Anchorage Alaska Quest and is obtainable in no other way. Once you finish the extra content you will be allowed to roam the wastes with the Gauss Rifle.
Search fallout new Vegas on Google or go to youtube im sure one of those two will have some info. if that does not work go to the website www.ign.com when i went on there they had many advertisements on new Vegas. You can also get some extra info and some sneak peeks at weapons, characters, locations, vaults and the like at WWW. Fallout.Wikia.com, at this site you can also get some info on other stuff like previous fallout games, weapons and even behind the scenes info on just about everything fallout
If you go to "Fallout.wikia.com" you can search their Fallout:NV section, which has the info you need (since i can't remember off the top of my head)
An alien, as in extra-terrestrial, has never been seen
an extra-terrestrial, an alien
Extra attractions at Club Vegas include online gambling and games such as Slots and Video Poker. You can get more information at the Club Vegas USA website.
Extra Terrorestrial Alien Encounter - 1994 was released on: USA: 1994 (Walt Disney World)
extra-terrestres or etranger
Extra-Terrestrial
Extra Terrestrial or E.T for short is the name for an Alien, that is not from this planet.
E.T. Extra Terrestrial E.T. Extra Terrestrial