Source: George R. Hess, North Carolina State University, go.ncsu.edu/posters
Source: North Carolina State University, https://projects.ncsu.edu/project/posters/
These instructions work for PowerPoint 2016 for Windows, the version of PowerPoint installed on campus computers.
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This library guide from University of North Carolina Health Sciences Library provides additional information on adding images, aligning content on your poster slide, and more.