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http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/atomi...
http://www.chemguide.co.uk/atoms/structures/giantcov.html
http://www.chm.bris.ac.uk/pt/harvey/gcse/covalent.html
http://www.docbrown.info/page04/4_72bond4.htm
http://chemical-bonding.wikispaces.com/Giant+Covalent+Structures
http://www.avogadro.co.uk/structure/chemstruc/network/g-molecular.htm
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