Carleton Copyright Guide
Can I use it in the classroom?
Copyright on Campus
Fair use determination
Overview of copyright law
Copyright Clearing Center's guide
Whenever possible, use Creative Commons licensed material instead of taking unnecessary risks that could put you in danger of infringing on someone's copyright!
https://copyright.columbia.edu/basics/permissions-and-licensing.html
http://copyright.cornell.edu/resources/publicdomain.cfm
http://booksearch.blogspot.com/2008/06/us-copyright-renewal-records-available.html
http://www.copyright.gov/circs/circ22.pdf
Center for Media & Social Impact
Code for Best Practices in Fair Use for OpenCourseWare