Resource materials on five EPR Centers web sites include:
University of Chicago http://epri.uchicago.edu/
Medical College of Milwaukee http://www.mcw.edu/display/router.asp?docid=1402
National High Magnetic Field Lab, Tallahassee http://www.magnet.fsu.edu/science/cimar/emr/
Additional Useful Sites
Bruker BioSpin www.Bruker-BioSpin.com and click on what is EPR.
Joseph Hornak has an introduction to NMR and MRI on his web page: http://www.cis.rit.edu/people/faculty/hornak/
Links to many other web sites are on Gunnar Jeschke's web page: http://www.epr.ethz.ch/links/index