More than 2.5 million volumes make up 4 special collections housed here. The History of Science collection includes volumes by Charles Darwin, Galileo, and others; the Western History collection includes historical photographs, books & manuscripts; the Bass Business History Collection; and the Carl Albert Congressional Archives, which contains congressional papers. The library is open July and August on Monday-Thursday, 8am-8pm; Friday, 8am-5pm; Saturday, 10am-4pm; Sunday, 1-5pm. The rest of the year, library hours are Monday-Friday, 8am-5pm & Saturday, 10am-4pm; closed on major holidays. Free to the public.