¡La Fantoma!

¡La Fantoma! is a skill magazine in Fallout: New Vegas. It is a temporary skill magazine, and wears off after a certain time period. It raises your Sneak skill by 10 points (20 points with the Comprehension perk).

Characteristics
Temporarily raises your sneak skill by 10 points (20 with Comprehension).

Locations

 * Southeast of Powder Ganger Camp West, down in a radioactive puddle with part of a bus, a burnt out car and large stack of radioactive barrels (+2-3 rads per second throughout most of the area with little to no protection). Follow the road south past the camp to the first billboard on the left (corvega billboard, the back of it will be facing the player), turn left into a small ditch that leads right into the puddle.
 * Nellis Air Force Base, Nellis Boomer Museum, on Pete's bed (with Patriot's Cookbook Tales of Chivalrie on the shelf above).
 * Crimson Caravan Company, Caravaneer Barracks, on a desk.
 * Zapp's Neon Signs entry next to couch.
 * In Boulder City, bottom of the mining equipment.
 * In H&H Tool Factory, on bookshelf in left of entrance room.
 * Underneath a few books on a table at the Recreation Office at Bitter Springs Recreation Area

Behind the Scenes
The image is a flipped replica of Adventure Comics 428, by DC comics. It is the origin issue of the character Black Orchid. The character was a master of disguise and imitation. Alternatively, this may also be a referance to The Shadow; a pulp legend who also shares these characteristics. The most likely issue being "The Star and the Twisted Cross".