HALLOWELL — Michael Kolster of Brunswick, associate professor of art at Bowdoin College, will give a presentation on his photography project, “A River Lost and Found: The Androscoggin River in Time and Place,” on Thursday, Dec. 8, at Harlow Gallery.

Kolster’s work explores how we perceive, depict and come to understand the changing nature of riverways as they recover from a century of industrial pollution.

He utilizes various photographic techniques and tools, including the antebellum wet-plate collodion process, black-and-white film negatives and digital processes.

An earlier project, “Changing Places,” similarly concerned with land-use policy and its implications, depicts changes in Las Vegas, San Francisco and New Orleans over a 10-year span.

The 6:30 p.m. event is presented by the Maine Traditional Film Photographers Group, which meets monthly at the gallery.

Admission is free with donations accepted at the door in support of programs at the gallery at 160 Water St.