QS has released its World University Rankings by Subject for 2013. According to the company's website, the rankings are designed to "provide comparative information at discipline level and to highlight the excellence of institutions in specialist areas".

The University of California, Davis was ranked No. 1 in the world for teaching and research in the area of agriculture and forestry, according to rankings released by QS World University Rankings. It was also placed 12th in environmental sciences and 25th in biological sciences in the worldwide university ranking.

The Pennsylvania State University was ranked in the top 50 in eight subject areas in the 2013 QS World University Rankings by Subject: 9th in agriculture and forestry; 12th in materials science; 10th in geography; 25th in Earth and marine sciences; 27th in education; 33rd in mechanical engineering; 40th in biological sciences; and 46th in communication and media studies.

The University of Delaware has been listed among the world's top institutions in four of the 30 subjects featured in this year's QS rankings: chemical engineering, agriculture and forestry, environmental sciences and linguistics. UD's ranking in chemical engineering falls within the 51-100 range, an improvement from its 2012 ranking in the 101-150 range. And, UD earned a ranking in the 51-100 range in agriculture and forestry, a new subject added to the 2013 rankings. It was also ranked in the 151-200 range for both linguistics and environmental studies.

World University Ranking Tables

America - US News & World Report, The Princeton Review, BusinessWeek
Canada - Maclean's, Gourman Report Ranking of Canadian Universities
UK - Sunday Times, Guardian, Times Good University Guide, Daily Telegraph
World - Shanghai Jiao Tong ARWU Rankings, Webometrics, Newsweek
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