A few more tidbits, <A HREF="http://www.tsha.utexas.edu/handbook/online/articles/PP/ryp2.html" target="_blank">http://www.tsha.utexas.edu/handbook/online/articles/PP/ryp2.html</A> <A HREF="http://www.searchanddiscovery.com/documents/broadhead/index.htm" target="_blank">http://www.searchanddiscovery.com/documents/broadhead/index.htm</A> <A HREF="http://ww1.edd.state.nm.us/images/uploads/UntilitiesEnergyTelecommunication2005.pdf" target="_blank">http://ww1.edd.state.nm.us/images/uploads/UntilitiesEnergyTelecommunication2005.pdf</A>