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E-resources are ubiquitous. The critical questions when you discover something potentially useful are:
Is it freely available?
If not, do we have access?
Will we have continue to have access?
vendors who are offering free access now may not be in the future
budget cuts may require us to cancel certain databases we currently subscribe to
Note that some of our subscription e-resources include "perpetual access", meaning even if we do not have access to the most current materials, things we paid for in the past continue to be available (Springer, Elsevier, and Sage fall into this category)
Is it sufficient for your course or do you need other/more?
Using OER or perpetual access materials first is the best and most stable bet for continued access.
Please see the subpages below for information on specific situations.