https://www.gamesradar.com/call-of-duty-black-ops-escalation-dlc-guide-call-of-the-dead/
Call of Duty: Black Ops Escalation DLC Guide - Call of the Dead | GamesRadar+
May 24, 2011 - The newest DLC pack for Call of Duty: Black Ops is here, and it packs a whopping four new multiplayer maps as well as a brand new Zombies mission
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