From Halopedia, the Halo wiki
Several Halo Encyclopedias have been produced throughout the lifespan of the Halo franchise. They document the Halo universe and its lore in great detail and depth, and are each several hundred pages long. As with most encyclopedias, they do not contain a narrative, and are instead well-suited to researching particular topics related to the Halo lore.
The existing Halo Encyclopedias are as follows:
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