[2]Quesenberry, and Chambliss. "Nitrogen Fixation and Inoculation of Forage Legumes." IFAS Extension. University of Florida. 16 Dec. 2007 <http://edis.ifas.ufl.edu/AG152>.
[3]Dazzo, Frank. "Rhizobia on Clover Root Hair." The Microbe Zoo. 1995. Digital Learning Center for Microbial Ecology. 16 Dec. 2007 <http://commtechlab.msu.edu/sites/dlc-me/zoo/zdrr0126.html>.
[4]Todar, Ken. "Ken Todar's Microbial World: Effects of Microbes on Their Habitat." Bacteriology At UW- Madison. 2006. University of Wisconsin - Madison. 16 Dec. 2007 <www.bact.wisc.edu>.
[5]Dazzo, Frank. "Rhizobium in Soil." The Microbe Zoo. 1995. Digital Learning Center for Microbial Ecology. 16 Dec. 2007 <http://commtechlab.msu.edu/sites/dlc-me/zoo/zdrr0126.html>.
[6]Poole, Philip. "Rhizobium." 6 July 2006. University of Reading. 16 Dec. 2007 <http://www.rdg.ac.uk/AcaDepts/sb/rhizobium/images/beans2.jpg>.
[7]"Legume Root Symbioses." Root Directory. University of Hawaii At Manoa. 16 Dec. 2007 <http://www.botany.hawaii.edu/faculty/webb/bot410/Roots/RizobInfectedCells300.jpg>.
[8]"This Week in Evolution." Cooperation Gets Complex. University of Minnesota. 16 Dec. 2007 <http://blog.lib.umn.edu/denis036/thisweekinevolution/2007/08/cooperation_gets_complex_1.html>.
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