The comics are the 14 issues of Savage Starlight, a fictional sci-fi series hidden from Pittsburgh to the Jackson epilogue. Collecting all of them earns the Endure and Survive trophy.
Pittsburgh: 4 (Force Carrier, Termination Shock, Accretion, Deep Phase). The Suburbs: 2 (Antiparticles, Messenger Particle). Tommy's Dam: 2 (Foreign Element, Zero Point). The University: 1 (Free Radicals). Lakeside Resort: 2 (Uncertainty, Negentropy). Bus Depot: 2 (Precipitate, Catalysis). Jackson: 1 (Singularity).
1 Termination Shock, 2 Messenger Particle, 3 Force Carrier, 4 Uncertainty, 5 Foreign Element, 6 Accretion, 7 Free Radicals, 8 Negentropy, 9 Precipitate, 10 Deep Phase, 11 Antiparticles, 12 Zero Point, 13 Catalysis, 14 Singularity.
Deep Phase sits behind a shiv door, so carry a shiv through the Financial District. Uncertainty and Negentropy are picked up as Ellie during Lakeside Resort.
Accretion
Accretion, issue 6 of Savage Starlight, sits on a coffee table in a lounge on the second floor of the Hotel Grand, during the Hotel Lobby section of Pittsburgh.
Antiparticles
Antiparticles, issue 11 of Savage Starlight, lies on the console in the bridge of the wrecked fishing boat on the beach at the start of The Suburbs.
Catalysis
Catalysis, issue 13 of Savage Starlight, sits at the end of the ventilation ducting that runs along the underground tunnel in Bus Depot.
Deep Phase
Deep Phase, issue 10 of Savage Starlight, waits in a child's bedroom behind a shiv door in the building where you meet Henry and Sam, in the Financial District section of Pittsburgh.