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ECRU (Electronic Course Reserves Unleashed) is an API for searching an index of the Library Course Reserves database, The database itself is maintained by reserves librarians who use the Library Reserves Tool or the Canvas Library Reserves Tool to create, revise, update, and delete reserves requests for specific courses.
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https://github.com/harvard-library/ecru/blob/master/ecru_url_patterns.md
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An overview of the ECRU data mode can be found at
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