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Lehigh's Visual Resources Library Guide:
(This is a technical how-to find and use visual resources guide.)
http://libraryguides.lehigh.edu/c.php?g=802590
Vanderbilt Vanderbilt's Center for Teaching's guide to better presentations:
(This guide contains educational theory, design strategies, resources, and student feedback data. )
https://cft.vanderbilt.edu/guides-sub-pages/making-better-powerpoint-presentations/
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