The Firefly Lab - The Hospital
Artifact #82: Surgeon's Recorder
As soon as you emerge from the stairwell, this will be in front of you on a counter.
Firefly Pendant #30
The room behind the counter is locked, but you can use a shiv to unlock it. Do so to find a pendant on a computer desk inside.
Artifact #83: Marlene's Recorder 1
From you entrance via the stairwell, make two quick right turns to enter a small room. Inside, you'll find another artifact next to a computer.
Artifact #84: Marlene's Journal
Continue around the corridor to find a large quarantine tent. Enter to find another artifact on a table inside.
Artifact #85: Marlene's Recorder 2
As you head down the final corridor to Ellie's operating room, make a right at the first door. In here, you'll find another artifact on a table near the window.