activity." Based on data for the 2020 fiscal year, the university received approximately $250 million in sponsored research for its main campus, with 81.4% coming from the government, 12.1% from foundations, 5.5% from industry, and 1.0% from private and other. An additional $120 million in sponsored research was for the Plasma Physics Lab; the main campus and the lab combined totaled to $370 million for sponsored research. Based on 2017 data, the university ranked 72nd among 902 institutions for research expenditures. Based on 2018 data, Princeton's National Academy Membership totaled to 126, ranking 9th in the nation. The university hosts 75 research institutes and centers and two national laboratories. Princeton is a member of the New Jersey Space Grant Consortium. Library system The Princeton University Library system houses over 13 million holdings through 11 buildings, including seven million bound volumes, making it one of the largest university libraries in the country. Built in 1948, the main campus library is Firestone Library and serves as the main repository for the humanities and social sciences. Its collections include the autographed manuscript of F. Scott Fitzgerald's The Great Gatsby and George F. Kennan's Long Telegram. In addition to Firestone library, specialized libraries exist for architecture, art and archaeology, East Asian studies, engineering, music, public and international affairs, public policy and university archives, and the sciences. The library system provides access to subscription-based electronic resources and databases to students. National laboratories The Department of Energy's Princeton Plasma Physics Laboratory (PPPL) stemmed from Project Matterhorn, a top secret cold war project created in 1951 aimed at achieving controlled nuclear fusion. Princeton astrophysics professor Lyman Spitzer became the first director of the project and remained director until the lab's declassification in 1961 when it received its current name. Today, it is an institute for fusion energy research and plasma physics research. Founded in 1955 and located at Princeton's Forrestal Campus since 1968, the NOAA's Geophysical Fluid Dynamics Laboratory (GFDL) conducts climate research and modeling. Princeton faculty, research scientists, and graduate scientists can participate in research with the lab. Admissions and financial aid Admissions Princeton offers several methods to apply: the Common Application, the Coalition Application, and the QuestBridge Application. Princeton's application requires several writing supplements and submitting a graded written paper. Princeton's undergraduate program is highly selective, admitting 5.8% of undergraduate applicants in the 2019–2020 admissions cycle (for the Class of 2024). The middle 50% range