I think it could be this one:
"Legend: the secret World of Lee Harvey Oswald" Edward Joy Epstein.
Publisher: McGraw-Hill 1978
Community Rec Department
PSC 819 BOX 14
FPO AE 09645-0017
From: Federal Librarians Discussion List [mailto:[log in to unmask]] On
Behalf Of Baker, Gary B CIV USARMY 902 MI GRP (US)
Sent: Friday, June 29, 2018 5:30 PM
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Subject: [FEDLIB] Looking for information on a book. (UNCLASSIFIED)
In "The Ten Commandments of Counterintelligence" author James Olson mentions
a book simply called "Legend."
The subject matter would be counterintelligence but we have no further
information on author, sub-title, publication date, etc.
Army Counterintelligence Center Library
Fort Meade, Md. 20755