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The National Archives created a set of worksheets for educators to use with students when they look at archival materials. They are handy to help you get into practice of thinking about objects.
Local Archives
Really nothing can beat putting your hands on real primary sources, Each of the Five Colleges has its own archives with its own particular strengths.
Use this database to search for collections on your topic. View the finding aids to see exactly what kinds of materials are in the files. Click on the Advanced Search button and then do a subject search on China. You may also add another keyword to get at the topic you want to research.