Branford Price Millar Library is housed in a six-story building on the PSU campus. The building includes a curved exterior wall covered with ceiling-to-floor windows on the eastern side of the building, wrapping around a copper beech tree planted on the site in the 1800s. Tan colored bricks are used for the other exterior walls. Inside, the library contains study rooms, a computer lab, offices, and the school's archives office in addition to the library's collections. With of space, the library is the largest academic library in the Portland metropolitan area and covers an entire city block. The library has a total of 1,430,929 print volumes in its collections and an annual circulation of 162,244 items (in 2014-2-15). In 2014-2015, the library received 1,076,571 visitors. PSU Library houses archival materials relating to the Hanford Site, and it is a federal depository library. The library is also a member of the Orbis Cascade Alliance. The library holds the Dark Horse Comic Collection, a gift from Dark Horse that brings two copies of every comic book, graphic novel, figurine, and more published and produced by publisher Dark Horse. The library manages PDXScholar, the open access, digital, institutional repository for the university.