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Carbon group. Digital image. //Carbon Group//. WikiEducator. Web. .

"carbon group element." __Encyclopædia Britannica__. 2009. Encyclopædia Britannica Online. 26 Oct. 2009 <**[]**>.

Hartzog, Kevin C. //Carbon Cycle//. Digital image. //Nutrient Cycles//. SAS. Web. .

Blashfiled, Jean F. //Sparks of Life: Carbon//. Austin, TX: RSVP, 1999. Print.

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