discussion tables for students to share thoughts and have group discussions. The Edward L. Doheny, Jr. Memorial Library is the main research library on campus. Rankings USC was ranked 22nd in U.S. News & World Reports 2020 annual ranking of national universities. In the Niche Best Colleges rankings, USC ranked 19th overall for 2020 based on academics and quality of student life. USC is ranked 32nd among national universities in the U.S. and 55th in the world by the Academic Ranking of World Universities, and 13th (tied with seven other universities) among national universities by The Center for Measuring University Performance. In 2015, USA Today ranked USC 22nd overall for American universities based on data from College Factual. Among top 25 universities, USC was ranked by U.S. News & World Report as having the 4th most economically diverse student body. Reuters ranked USC as the 14th most innovative university in the world in 2015, as measured by the university's global commercial impact and patents granted. USC was ranked 15th overall in the 2016 inaugural Wall Street Journal/Times Higher Education ranking of U.S. colleges. In 2016, USC was ranked as a "Top 10 Dream College" according to The Princeton Review, as conferred from a survey of 10,000 respondents. USC appeared in the top 10 list for both parents and students. On the 2011 "Green Report Card", issued by the Sustainable Endowments Institute, the university received a B−. The Annenberg School for Communication and Journalism was ranked 1st in 2014 by USA Today. In its 2020 rankings, U.S. News & World Report rates USC's School of Law as 17th, the Marshall School of Business tied for 17th with the USC Leventhal School of Accounting 7th and the Lloyd Greif Center for Entrepreneurial Studies 9th; the Keck School of Medicine of USC was ranked tied for 30th in research and tied for 53rd in primary care, the Viterbi School of Engineering 9th, the Rossier School of Education 12th, the Roski School of Fine Arts graduate program 69th, the Sol Price School of Public Policy 3rd, the USC School of Social Work 25th, and the USC School of Pharmacy tied for 9th. USC's graduate programs in occupational therapy and physical therapy are ranked the nation's 1st and 4th best programs, respectively, for 2021 by U.S. News & World Report. The Philosophical Gourmet Report in 2015 ranked USC's graduate philosophy program as 8th nationally. The