After these excursions I returned to the room I had never quitted, like a doppelganger in a German tale, and came to myself with a start.
"The Magic Skin"
Honore de Balzac
At least, so I thought for a moment, and felt as if I had seen a spectre; the resemblance was so exact-in size, in every detail, even to the little clumps of hair about the hind parts, even to the lop of half an ear, this dog might have been the doppelganger of the deceased Bingo.
"Stories By English Authors: London"
Various
We've sent out a doppelganger to fool the Sons, and the orderly has been sentenced to slavery under the pyramid builder for twenty lifetimes.
"The Sky Is Falling"
Lester del Rey