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University of Exeter: Search Techniques: Combining Search Terms
This resource explains how to use the Boolean operators AND, OR, and NOT to broaden or narrow a web search.
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Morningside College: Keyword Searching: Advanced Search Techniques
Information about how to use advanced techniques when searching for information online. Covers the use of wildcard symbols, truncation, proximity searching, and how to combine tools.
Colorado State University
Boolean Tutorial
Although this site is designed for teaching efficient searching techniques, it provides an engaging tutorial on the Boolean operators AND, OR and NOT.
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Bare Bones Lesson 7: Basic Search Tips
These quick tips will work with almost any search engine. Do the assignments to practice the techniques that are presented.