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The Houston Public Library is a dynamic organization that serves one of the largest service areas—both in population and area—in the United States. The library system is comprised of forty-four public service units including thirty-one Neighborhood Libraries, four Regional Libraries, three Special Collection Libraries, and four Express Libraries, as well as the HPL Mobile Express and a satellite library located at the Children’s Museum of Houston. They host the Houston Public Poetry quarterly reading series and other literary events throughout the year.