The Prison Library Support Network, established in 2015, works to meet the information needs of people who are incarcerated through a nationwide letter-writing project. Since the reference by mail program started in 2021, the New York City–based collective of librarians, graduate students, and activists has responded to nearly all of the 3,000 queries it has received from people in prisons across the United States, with the majority of letters coming from Texas, Pennsylvania, Illinois, Ohio, and Florida. {read}