Available online The Public's emotive and effective hour-long play uses actors, including Lorraine Toussaint and Alison Pill, to share powerful testimonials In mid-March, when New York City abruptly shut its theaters, Coal Country, a documentary drama by Jessica Blank and Erik Jensen, was another casualty. Under lockdown, Blank and Jensen, best known for The Exonerated, began to interview the city's frontline healthc…