LYCOS RETRIEVER 
Dewey Decimal System: Categories
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Each one of the 10 major categories in the Dewey Decimal system covers a different subject. For example, the 300 category includes everything about the Social Sciences, like Government or Law. The 800 category includes everything about Literature. Once you get used to how things are organized, you'll find it very easy to locate the information you're looking for.
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Look at 500 in the summary of the Dewey Decimal Classification scheme shown below. Notice that it covers the broad category of science, while the more specific number 540 is used to classify chemistry specifically.
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Have learners search the Internet for sites that meet each one of the ten main categories of the Dewey Decimal System. After finding a site, the learner should note the URL and title of the site and explain why the site should be placed in that category. Encourage students to be creative with their final products. They may be written, oral, pictorial, electronic, or Web-based.
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