http://www.forestry.utoronto.ca/wood/amrit.htm

http://www.edf.org/pubs/FactSheets/h_mmt1.html

http://www.man.poznan.pl/~bielecki/gal.htm

http://www.man.poznan.pl/~bielecki/polhistory.htm

http://forsite.net/neelys-news/
http://www.webpak.net/~cjlovell/neways/hazard.htm
http://www.oz.net/~johnre/neways/avoid.htm
http://www.micronauts.com/hrmngrds.htm
http://www.usa-nutritional.com/reports/sls.html
http://www.facstaff.bucknell.edu/rbeard/diction1.html