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Scholar OneSearch is NU's library catalog and discovery system. Use it to find out what books, and journal subscriptions are available at Snell Library, as well as for articles, theses, data sets, videos and music, and document searching.
Mathematics has its own Subject Classification system to help people find articles and other materials on specific subjects. Mostly used in Mathematical Reviews (MathSciNet) and Zentrallblatt MATH, it is a useful for looking at similar articles, or for understanding the different types and branches of mathematics.