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Graphite Production by Country (Metric tons). (2009). Retrieved November 5, 2013, from Indexmundi.com: http://www.indexmundi.com/minerals/?product=graphite&graph=production
Incense-Cedar (Calocedrus decurrens) Species Details and Allergy Info. (2013). Retrieved November 4, 2013, from Pollenlibrary.com: http://www.pollenlibrary.com/Specie/Calocedrus+decurrens/
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How Are Pencils Made? (2013). Retrieved November 5, 2013, from Faber-castell.com.au: http://www.faber-castell.com.au/55722/Products/Playing-Learning/Products/Colour-Pencils/How-Are-Pencils-Made/splrn_index1.aspx
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Pencil Making Today: 10 Steps to the Perfect Pencil . (2013). Retrieved November 5, 2013, from Pencils.com: http://www.pencils.com/blog/pencil-making-today/
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The Environmental Impact of a Pencil. (2013). Retrieved November 5, 2013, from The Daily Green: http://www.thedailygreen.com/environmental-news/latest/pencils-47082504
World Book. (2013). Retrieved November 5, 2013, from Worldbookonline.com: http://www.worldbookonline.com/wb/Login?ed=wb&tu=http%3A%2F%2Fwww.worldbookonline.com%2Fadvanced%2Farticle%3Fid%3Dar233020%26st%3Dgraphite
World Graphite Producing Countries Map. (2013). Retrieved November 5, 2013, from Mapsofworld.com: http://www.mapsofworld.com/minerals/world-graphite-producers.html
Graphite Production by Country (Metric tons). (2009). Retrieved November 5, 2013, from Indexmundi.com: http://www.indexmundi.com/minerals/?product=graphite&graph=production
Incense-Cedar (Calocedrus decurrens) Species Details and Allergy Info. (2013). Retrieved November 4, 2013, from Pollenlibrary.com: http://www.pollenlibrary.com/Specie/Calocedrus+decurrens/
About Incense-cedar - Pencils.com. (2013). Retrieved November 5, 2013, from Pencils.com: http://www.pencils.com/blog/incense-cedar/
How Are Pencils Made? (2013). Retrieved November 5, 2013, from Faber-castell.com.au: http://www.faber-castell.com.au/55722/Products/Playing-Learning/Products/Colour-Pencils/How-Are-Pencils-Made/splrn_index1.aspx
How pencil is made - material, manufacture, making, history, used, processing, steps, product, machine, Raw Materials, The Manufacturing Process of pencil, Colored pencils, Quaility Control. (2013). Retrieved November 5, 2013, from Madehow.com: http://www.madehow.com/Volume-1/Pencil.html
Life-Cycle Studies: Pencils | Worldwatch Institute . (2013). Retrieved November 5, 2013, from Worldwatch.org: http://www.worldwatch.org/node/6422
Pencil Making Today: 10 Steps to the Perfect Pencil . (2013). Retrieved November 5, 2013, from Pencils.com: http://www.pencils.com/blog/pencil-making-today/
Read, I, Pencil | Library of Economics and Liberty. (2013). Retrieved November 5, 2013, from Econlib.org: http://www.econlib.org/library/Essays/rdPncl1.html
The Environmental Impact of a Pencil. (2013). Retrieved November 5, 2013, from The Daily Green: http://www.thedailygreen.com/environmental-news/latest/pencils-47082504
World Book. (2013). Retrieved November 5, 2013, from Worldbookonline.com: http://www.worldbookonline.com/wb/Login?ed=wb&tu=http%3A%2F%2Fwww.worldbookonline.com%2Fadvanced%2Farticle%3Fid%3Dar233020%26st%3Dgraphite
World Graphite Producing Countries Map. (2013). Retrieved November 5, 2013, from Mapsofworld.com: http://www.mapsofworld.com/minerals/world-graphite-producers.html