Research library in the context of "Primary source"

The Library of Congress (LC or sometimes LOC) is a research library in Washington, D.C., serving as the library and research service for the United States Congress and the de facto national library of the United States. It also administers copyright law through the United States Copyright Office, and it houses the Congressional Research Service.

Founded in 1800, the Library of Congress is the oldest federal cultural institution in the United States. It is housed in three buildings on Capitol Hill, adjacent to the United States Capitol, along with the National Audio-Visual Conservation Center in Culpeper, Virginia, and additional storage facilities at Fort George G. Meade and Cabin Branch in Hyattsville, Maryland. The library's functions are overseen by the librarian of Congress, and its buildings are maintained by the architect of the Capitol. The LC is one of the largest libraries in the world, containing approximately 173 million items and employing over 3,000 staff. Its collections are "universal, not limited by subject, format, or national boundary, and include research materials from all parts of the world and in more than 470 languages".

The Vatican Apostolic Library (Latin: Bibliotheca Apostolica Vaticana, Italian: Biblioteca Apostolica Vaticana), more commonly known as the Vatican Library or informally as the Vat, is the library of the Holy See, located in Vatican City, and is the city-state's national library. It was formally established by Pope Sixtus IV on June 15, 1475, by the papal bull Ad decorem militantis ecclesiae, although it is much older. It is one of the oldest libraries in the world and contains one of the most significant collections of historical texts. It has 75,000 codices from throughout history, as well as 1.1 million printed books, which include some 8,500 incunabula.

The Vatican Library is a research library for history, law, philosophy, science, and theology. The Vatican Library is open to anyone who can document their qualifications and research needs. Photocopies for private study of pages from books published between 1801 and 1990 can be requested in person or by mail.

The Newberry Library is an independent research library, specializing in the humanities. It is located in Chicago, Illinois, and has been free and open to the public since 1887. The Newberry's mission is to foster a deeper understanding of our world by inspiring research and learning in the humanities and encouraging conversations about ideas that matter. Its mission is rooted in a growing and accessible collection of rare and historical materials.

The Folger Shakespeare Library is an independent research library on Capitol Hill in Washington, D.C., United States. It has the world's largest collection of the printed works of William Shakespeare, and is a primary repository for rare materials from the early modern period (1500–1750) in Britain and Europe. The library was established by Henry Clay Folger in association with his wife, Emily Jordan Folger. It opened in 1932, two years after his death.

The library offers advanced scholarly programs and national outreach to K–12 classroom teachers on Shakespeare education. Other performances and events at the Folger include the award-winning Folger Theatre, which produces Shakespeare-inspired theater; Folger Consort, the early-music ensemble-in-residence; the O.B. Hardison Poetry Series; the PEN/Faulkner Foundation Reading Series; and numerous other exhibits, seminars, talks and lectures, and family programs. It also has several publications, including the Folger Library editions of Shakespeare's plays, the journal Shakespeare Quarterly, the teacher resource books Shakespeare Set Free, and catalogs of exhibitions. The Folger is also a leader in methods of preserving rare materials.

The New York Public Library (NYPL) is a public library system in New York City. With nearly 53 million items and 92 locations, the New York Public Library is the second-largest public library in the United States behind the Library of Congress and one of the largest public libraries 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 the Bronx, Manhattan, and Staten Island and affiliations with academic and professional libraries in the New York metropolitan area. The city's other two boroughs, Brooklyn and Queens, are not served by the New York Public Library system, but rather by their respective borough library systems: the Brooklyn Public Library and the Queens Public Library. 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.

The Stephen A. Schwarzman Building (commonly known as the Main Branch, the 42nd Street Library, or just the New York Public Library) is the flagship building in the New York Public Library system in the Midtown neighborhood of Manhattan in New York City. The branch, one of four research libraries in the library system, has nine divisions. Four stories of the structure are open to the public. The main entrance steps are at Fifth Avenue at its intersection with East 41st Street. As of 2015, the branch contains an estimated 2.5 million volumes in its stacks. The building was declared a National Historic Landmark, a National Register of Historic Places site, and a New York City designated landmark in the 1960s.

The Main Branch was built after the New York Public Library was formed as a combination of two libraries in the late 1890s. The site, along Fifth Avenue between 40th and 42nd Streets, is located directly east of Bryant Park, on the site of the Croton Reservoir. The architectural firm Carrère and Hastings constructed the structure in the Beaux-Arts style, and the structure opened on May 23, 1911. The marble facade of the building contains ornate detailing, and the Fifth Avenue entrance is flanked by a pair of stone lions that serve as the library's icon. The interior of the building contains the Main Reading Room, a space measuring 78 by 297 feet (24 by 91 m) with a 52-foot-high (16 m) ceiling; a Public Catalog Room; and various reading rooms, offices, and art exhibitions.

The State Library of South Australia, or SLSA, formerly known as the Public Library of South Australia, located on North Terrace, Adelaide, is the official library of the Australian state of South Australia. It is the largest public research library in the state, with a collection focus on South Australian information, being the repository of all printed and audiovisual material published in the state, as required by legal deposit legislation. SLSA's holdings include rare books, maps, manuscripts, and ephemera. It holds the "South Australiana" collection, which documents South Australia from pre-European settlement to the present day, as well as general reference material in a wide range of formats, including digital, film, sound and video recordings, photographs, and microfiche.

As of October 2025, the director of the library is Megan Berghuis, who was appointed in 2024, after the retirement of Geoff Strempel.

The Bamberg State Library (German: Staatsbibliothek Bamberg) is a combined universal, regional and research library with priority given to the humanities. Today it is housed in the New Residence, the former prince-bishop's new palace. The Free State of Bavaria is responsible for the library.