Peel-apart instant film. Article says "Polaroid-type" which means it's probably the Fuji FP-100C, which is out of production. Article also says a "large camera" which could mean anything. The peel-apart film was used in the Polaroid Land Cameras, starting with the 100 series. There are also large-format cameras that have Polaroid backs, so maybe it's 4x5 peel-apart (regular peel-apart is 3.23 x 4.24). No way of telling the original dimensions from an Internet article.
It looks like the photographer isn't just peeling the print off of the other layer, but leaving the paper of that other layer stuck to the border of the print. Or these could possibly be recovered negatives, though the colors tend to shift a bit in those negatives and the paper is not usually intact after the process. Could be, though.
Oh yes, and Google is your friend, so perhaps you might more information if needed by just poking around there for a bit.
Intimate Portraits of Survivors In Places Where Love is Illegal
"I photographed all 65 subjects using a Polaroid-type film on a large-format field camera. I made a deal with every subject: If they thought the photo put them in danger, they could destroy it. Having a physical photograph gave them this option."
Edit: The film, then, is probably Fujifilm FP-100C-45.