For designing devices to match up with people, you may want to have information about how people "measure up" and how they think.
Collections include these classic texts:
These scanned books lack most of the features that would make them easy to use but at least you may access them as electronic copies.
Repositories allow access to data sets deposited by researchers.
This page in the Data Management LibGuide --- look down the page --- gives information on how to find likely repositories.
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