Ira Cohen, a bookseller and art model who kept a literary spirit alive in a tough New England seaport, died in January at 70 years old after a brief illness. Cohen was the focus of what turned out to be the last show UMass Dartmouth exhibited at its gallery in downtown New Bedford before the university abruptly closed its campus there at the end of August. For this week’s Artscape, South Coast Bureau Reporter Ben Berke interviewed more than a dozen people who knew Cohen. The result is a collection of stories, memories and impressions that form another lasting portrait of Cohen.