Vintage Wallpaper Find

I was out at the salvage store the other day and of course I can't leave without checking the free pile!

What did I come across but 3+ rolls of this lavender, gray and blue butterfly 1940's? 50's? wallpaper in decent shape! 

 It is stamped United Wallpaper on the back.

I think there is enough to do the back wall in the currently troll/office room which will someday be my spare purple bedroom with my fancy iron bed. (another project still in the back of my parent's garage)