This ebay listing is for a softcover, 94-page book titled, "They Died at Fort Delaware, 1861-1865, Confederate, Union and Civilian."  Published in 1997 by The Fort Delaware Society.  Written by Jocelyn P. Jamison.  Contains lists of deceased including names; alternate name, if applicable; Rank; Company; Unit; Captured Status; Date; Cause of Death, if known; Date DD; Ref.  In very nice condition and great reference tool.