There are 6 dead ghosts in the DLC The Dark Below. I now have 69 ;)
The link shows where to find them.
English
#Destiny
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I suggest that Y'all should use DestinyGhostHunter.net You type in your GTag or ID and and then it shows you where all the ghosts are and what ones you've already gotten.
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3 in siege of the warmind, 3 in the awakening
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Cheers!