Grand Theft Auto 5 Epsilon Tracts can be collected after the eight and final Epsilon mission.
The Epsilon Tract collection challenge is available after completing the eighth and final Epsilon mission. You will then receive a text message from Marnie explaining that the Tract collections are available the locations of which can be found on the Epsilon website (www.epsilonprogram.com). When you collect a Tract collectible, an excerpt from the Epsilon Paradigm appears on the Website.
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