The document summarizes the origins and history of the British Library. It discusses how the British Library was formed from the merging of the British Museum Library in 1753, the Patent Office Library in 1855, and the establishment of the British Library as an independent entity in 1973. It also describes the British Library's main locations over time, including its current location at St. Pancras opened in 1997, as well as its science reading rooms and facility in Boston Spa. Finally, it provides information about the British Library's digital services and online resources.