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Contact Harvest-Fall of Reach-Cole Protocol-The Flood-First Strike-Ghosts of Onyx
"You must be mistaken, Reclaimer. I've met your makers, and they don't even know your name..."
Cole Protocol is set before the Fall of Reach. Other then that, see above.
Signatures are for squares.
You really don't need to read anything other than Fall of Reach, First Strike, then Ghosts of Oynx. The other 3 are like bonus.