I am working on this DLC now and i would like to get the Snow Globe before i miss it can anyone tell me where it is?

http://fallout.wikia.com/wiki/Snowglobe

There you go.

That one's probably the toughest one to find in the game. Follow the Wiki instructions about where to find it in Salida del Sol North. The room it's found in has a bunch of desks stacked up on their sides.