Dr. Halsey's personal journal
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Dr. Halsey's Personal Journal is a booklet co-written by Eric Nylund and is included with the Halo: Reach Limited and Legendary editions.[1] Not much is known about it, other than it covering various things in the Halo Universe.
A page of the journal, detailing the SPARTAN-II Augmentation Procedures.
Another page, with information on the creation of Cortana.