Stanford's first library occupied a single room in the northeast corner of the inner quadrangle, accommodating 100 readers. By 1900, a separate building on the outer quad -- named after Leland Stanford's brother Thomas Welton Stanford -- proved too small almost immediately. A larger replacement was under construction when the 1906 San Francisco earthquake destroyed it before completion. The current system, anchored by Green Library as its main facility, encompasses more than 24 libraries holding nearly 12 million items: 260,000 rare books, 3 million e-books, 1.5 million audiovisual materials, 75,000 serials, and 6 million microform holdings. The largest physical repository is Stanford Auxiliary Library 3 in Livermore, a cost-saving measure that provides one-day delivery back to campus.

In the 1980s, Stanford nearly became home to the Ronald Reagan Presidential Library. Reagan's records from eight years as California governor were already housed in the Hoover Institution on campus. In 1984, the Board of Trustees approved the placement of the library and museum on a 20-acre site near the golf course. But negotiations collapsed when Reagan's advisers insisted on including a public affairs research center and think tank -- a condition Stanford's trustees rejected as incompatible with academic independence. The proposal was dropped in 1987, and the Reagan Library was built in Simi Valley instead. Reagan's gubernatorial records were transferred there from Hoover in 2000.

Beginning in 2004, Stanford Libraries collaborated with Google to digitize hundreds of thousands of books, making them available worldwide at no charge. The partnership was among the first of its kind and reflected the university's position at the intersection of traditional scholarship and digital innovation. Stanford has been a Federal Depository Library since 1895, collecting government documents for over a century. The Maps of Africa Collection, recognized with the acquisition of the Oscar I Norwich collection in 2001, includes 859 maps. It is one of those details that captures the breadth of the system: a library in Silicon Valley holding one of the world's finest collections of African cartography.