Userful Links         1. http://www.spectroscopynow.com 2. http://www.cis.rit.edu/htbooks/nmr 3. http://www.learnxrf.com 4. http://www.amptek.com/xrf.html 5. http://www.varianinc.com/cgi-bin/nav?/corp/businesses/nmr 6. http://www.serc-dst.org/sfic.htm