Question: About how many items does the library that the 53rd Street Library is a branch of contain?

Context paragraphs:
53rd Street Library: The 53rd Street Library is a branch of the New York Public Library at 18 West 53rd Street just across the street from the Museum of Modern Art.  It opened in 2016 as a replacement for the Donnell Library Center, which occupied a building at 20 West 53rd Street from 1955 until 2008 when it was closed and the building razed to allow a 46-story hotel/condo complex to be constructed.

53rd Street (BMT Fourth Avenue Line): 53rd Street is a local station on the BMT Fourth Avenue Line of the New York City Subway.  Located at 53rd Street and Fourth Avenue in Sunset Park, Brooklyn, it is served by the R train at all times, several W trains during rush hours, and the N train during late nights only.

Library of Congress Subject Headings: The Library of Congress Subject Headings (LCSH) comprise a thesaurus (in the information science sense, a controlled vocabulary) of subject headings, maintained by the United States Library of Congress, for use in bibliographic records.  LC Subject Headings are an integral part of bibliographic control, which is the function by which libraries collect, organize and disseminate documents.  LCSHs are applied to every item within a library’s collection, and facilitate a user’s access to items in the catalogue that pertain to similar subject matter.  If users could only locate items by ‘title’ or other descriptive fields, such as ‘author’ or ‘publisher’, they would have to expend an enormous amount of time searching for items of related subject matter, and undoubtedly miss locating many items because of the ineffective and inefficient search capability.

Kern Branch, Beale Memorial Library: Kern Branch, Beale Memorial Library, also known as the Baker Street Library, is a library located at 1400 Baker St. in Bakersfield, California.  The library was constructed from 1913 to 1915 and replaced Bakersfield's original library building.  Architect O. L. Clark designed the building in the Classical Revival style; the library is the only surviving building designed by Clark in Bakersfield.  The library is designed as a central block with two wings at the east and west ends.  The library's main entrance is located on the east wing; the entrance is a portico supported by columns and topped with a pediment and a frieze reading "PUBLIC LIBRARY".  The ornate interior decorations incorporate classical and Renaissance themes.

Seventh Avenue (IND Queens Boulevard Line): Seventh Avenue is a station on the IND Sixth Avenue Line and the IND Queens Boulevard Line of the New York City Subway.  Located at the intersection of Seventh Avenue and 53rd Street in Manhattan, it is served by the D and E trains at all times, and the B train weekdays.  The station is announced as Seventh Avenue–53rd Street, in the style of other stations that orient east-west along 53rd Street (such as Fifth Avenue/53rd Street and Lexington Avenue–53rd Street), as well as to prevent confusion with Seventh Avenue along Flatbush Avenue in Brooklyn, which is also served by the B.

New York Public Library: The New York Public Library (NYPL) is a public library system in New York City.  With nearly 53 million items, the New York Public Library is the second largest public library in the United States (behind the Library of Congress), and fourth largest in the world.  It is a private, non-governmental, independently managed, nonprofit corporation operating with both private and public financing.  The library has branches in the boroughs of Manhattan, The Bronx, and Staten Island, and affiliations with academic and professional libraries in the metropolitan area of New York State.  The City of New York's other two boroughs, Brooklyn and Queens, are served by the Brooklyn Public Library and the Queens Library, respectively.  The branch libraries are open to the general public and consist of circulating libraries.  The New York Public Library also has four research libraries which are also open to the general public.

Boston Public Library: The Boston Public Library is a municipal public library system in Boston, Massachusetts, United States, founded in 1848.  The Boston Public Library is also the Library for the Commonwealth (formerly "library of last recourse") of the Commonwealth of Massachusetts; all adult residents of the commonwealth are entitled to borrowing and research privileges, and the library receives state funding.  The Boston Public Library contains approximately 23 million items encompassing all formats including books, DVDs, CDs, maps, music scores, microfilm, manuscripts, prints and other visual materials, and electronic resources, making it the third-largest public library in the United States behind only the Library of Congress (with 160 million items) and the New York Public Library (with 53 million items), according to the American Library Association.  In fiscal year 2014, the library held over 10,000 programs, all free to the public, and lent 3.7 million materials.

55th Battalion (Australia): The 55th Battalion was an infantry battalion of the Australian Army.  Raised in 1916 for service during World War I the battalion served on the Western Front until the end of the war, before being briefly amalgamated with the 53rd Battalion and then being disbanded in 1919.  In 1921, the 55th Battalion was re-raised and in 1927 adopted the title of the "New South Wales Irish Rifles".  This designation was later changed to the "New South Wales Rifle Regiment" in 1930, before they were once again amalgamated with the 53rd, forming the 55th/53rd Battalion (New South Wales Rifle/West Sydney Regiment) in 1937.  In October 1941, during World War II, the two battalions were delinked and the 55th was later deployed to New Guinea, where they took part in the Kokoda Track campaign, fighting against the Japanese.  Poorly prepared and trained, and lacking up to date equipment, they performed above expectations; however, they were amalgamated with the 53rd, which had not fared so well, once more in October 1942.  The 55th/53rd subsequently took part in further campaigns in New Guinea and Bougainville before being disbanded in May 1946.

River crossing puzzle: A river crossing puzzle is a type of transport puzzle in which the object is to carry items from one river bank to another, usually in the fewest number of trips.  The difficulty of the puzzle may arise from restrictions on which or how many items can be transported at the same time, or which or how many items may be safely left together.  The setting may vary cosmetically, for example, by replacing the river by a bridge.  The earliest known river-crossing problems occur in the manuscript "Propositiones ad Acuendos Juvenes" (English: Problems to sharpen the young ), traditionally said to be written by Alcuin.  The earliest copies of this manuscript date from the 9th century; it contains three river-crossing problems, including the fox, goose and bag of beans puzzle and the jealous husbands problem.

53rd Street Crosstown Line: The 53rd Street Crosstown Line was a surface transit line in Manhattan, New York City, United States, running along 53rd Street in Midtown, between Sixth Avenue and Ninth Avenue.  It served as a connection between north-south lines during the times that they were not affiliated with the 59th Street Crosstown Line.  The street is no longer used by buses, which now use 59th Street to make the crosstown connection.

Supporting paragraphs: 53rd Street Library New York Public Library
Answer: nearly 53 million items