Links

Gnuplot - A portable command-line driven graphing utility for linux,
OS/2, MS Windows, OSX, VMS, and many other platforms:
http://www.gnuplot.info

LaTeX - A document preparation system:
http://www.latex-project.org

The Basics of NMR by Joseph P. Hornak, Ph.D.:
http://www.cis.rit.edu/htbooks/nmr

Molecular Weight Calculator (with % by mass):
http://environmentalchemistry.com/yogi/reference/molar.html