[2] http://www.equalearth.org/agriculturepollution.htm
[3] http://www.bls.gov/opub/ooq/2005/spring/art02.pdf
[4] http://history-world.org/stone_age2.htm
[5] http://search.eb.com/eb/article-9026726
[6] http://inventors.about.com/od/cstartinventions/a/cotton_gin.htm
[7] http://inventors.about.com/library/inventors/blfarm1.htm]
[8] http://inventors.about.com/od/tstartinventions/a/tractors.htm
[9] http://www.uvm.edu/vtvegandberry/factsheets/cultivators.html
[10] http://library.thinkquest.org/TQ0312380/machine.htm
[11] http://techtran.msfc.nasa.gov/at_home/farm1.html
[12] http://kernow.curtin.edu.au/www/Agrirobot1/shmagic.htm
[13] http://www.delaval.com/default.htm
[14] http://www.bls.gov/opub/ooq/2005/spring/art02.pdf
[15] http://www.netlink.de/gen/Zeitung/2000/001017.html
[16] http://oregonstate.edu/dept/ncs/newsarch/2001/Sep01/veggies.htm
[17] http://landsat.gsfc.nasa.gov/
[18] http://trmm.gsfc.nasa.gov/
[19] http://www.cnn.com/2007/US/Careers/01/08/cb.danger/index.html
[20] http://www.pp.okstate.edu/ehs/training/OSHAFARM.HTM
[21] http://farmsafety.ucdavis.edu/Newsletters/Spring98.html
[22] http://www.wemjournal.org/wmsonline/?request=get-document&issn=1080-6032&volume=012&issue=03&page=0168
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