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education.jlab.org
http://education.jlab.org/itselemental/ele002.html
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Organic Keywords: 18,858
Organic Competitors: 801
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PPC Keywords: 0
PPC Competitors: 0
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education.jlab.org
http://education.jlab.org/itselemental/ele002.html
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Organic Keywords: 18,858
Organic Competitors: 801
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PPC Keywords: 0
PPC Competitors: 0
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webelements.com
https://www.webelements.com/helium/history.html
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Organic Keywords: 15,176
Organic Competitors: 938
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PPC Keywords: 0
PPC Competitors: 75
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en.wikipedia.org
https://en.wikipedia.org/wiki/Helium
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Organic Keywords: 26,359,258
Organic Competitors: 968
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PPC Keywords: 20
PPC Competitors: 165
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rsc.org
http://www.rsc.org/periodic-table/element/2/helium
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Organic Keywords: 50,085
Organic Competitors: 659
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PPC Keywords: 5
PPC Competitors: 0
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nautilus.fis.uc.pt
http://nautilus.fis.uc.pt/st2.5/scenes-e/elem/e00210.html
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Organic Keywords: 420
Organic Competitors: 766
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PPC Keywords: 0
PPC Competitors: 0
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acs.org
https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/heliumnaturalgas.html
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Organic Keywords: 20,430
Organic Competitors: 825
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PPC Keywords: 1
PPC Competitors: 0
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universetoday.com
http://www.universetoday.com/53563/who-discovered-helium/
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Organic Keywords: 51,908
Organic Competitors: 909
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PPC Keywords: 0
PPC Competitors: 0
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livescience.com
http://www.livescience.com/28552-facts-about-helium.html
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Organic Keywords: 363,624
Organic Competitors: 1,097
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PPC Keywords: 0
PPC Competitors: 0
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periodic.lanl.gov
http://periodic.lanl.gov/2.shtml
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Organic Keywords: 3,828
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PPC Keywords: 0
PPC Competitors: 0
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