The Snipers' nest log is an optional artifact on a lookout balcony at the University of Eastern Colorado. From the depot where you find the flamethrower, take the stairs to the top level, step out onto the balcony and check the corner beside some crafting parts.
A gate log of arrivals and departures at the Firefly base: recruits from the Chicago zone, supply trucks, a biologist from San Francisco and crates of lab gear from a hospital. Between entries the two guards joke, complain about boredom and swap stolen apples.
The last entries record doctors and recruits leaving and a convoy of trucks arriving while the guards wonder what the commotion is about. It is your first hint that the Fireflies may be packing up.
Firefly's recorder
The Firefly's recorder is an automatic artifact in the university science building. Joel picks it up from a dead Firefly in a cutscene, so it cannot be missed, and you can play the whole message later from the Artifacts menu.
Free Radicals
Free Radicals, issue 7 of Savage Starlight, is on the rusty hood of a car up the hill behind you as The University begins.
Fungal X-rays
The Fungal X-rays are an optional artifact in the university science building. After you follow Ellie through the short tunnel, turn left and check the far table next to the window.
Griggs's Firefly Pendant
Griggs's Firefly pendant lies on a table in the last tent of a camp outside the science building, in the Go Big Horns section of The University. It belonged to Erik Griggs.