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history.com
http://www.history.com/topics/dust-bowl
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Organic Keywords: 507,513
Organic Competitors: 854
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PPC Keywords: 127
PPC Competitors: 2,419
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english.illinois.edu
http://www.english.illinois.edu/maps/depression/dustbowl.htm
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Organic Keywords: 17,151
Organic Competitors: 0
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PPC Keywords: 0
PPC Competitors: 0
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en.wikipedia.org
https://en.wikipedia.org/wiki/Dust_Bowl
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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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encyclopedia.com
http://www.encyclopedia.com/places/united-states-and-canada/us-physical-geography/dust-bowl
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Organic Keywords: 376,230
Organic Competitors: 1,122
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PPC Keywords: 0
PPC Competitors: 0
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livinghistoryfarm.org
http://www.livinghistoryfarm.org/farminginthe30s/water_02.html
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Organic Keywords: 6,801
Organic Competitors: 881
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PPC Keywords: 0
PPC Competitors: 0
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pbs.org
http://www.pbs.org/kenburns/dustbowl/about/overview/
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Organic Keywords: 416,178
Organic Competitors: 966
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PPC Keywords: 90
PPC Competitors: 28,449
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pbs.org
http://www.pbs.org/kenburns/dustbowl/legacy/
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Organic Keywords: 416,178
Organic Competitors: 966
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PPC Keywords: 90
PPC Competitors: 28,449
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loc.gov
http://www.loc.gov/teachers/classroommaterials/presentationsandactivities/presentations/timeline/depwwii/dustbowl/
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Organic Keywords: 203,778
Organic Competitors: 1,033
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PPC Keywords: 220
PPC Competitors: 3,971
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americaslibrary.gov
http://www.americaslibrary.gov/es/ok/es_ok_dustbowl_1.html
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Organic Keywords: 18,075
Organic Competitors: 861
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PPC Keywords: 0
PPC Competitors: 0
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drought.unl.edu
http://drought.unl.edu/DroughtBasics/DustBowl/DroughtintheDustBowlYears.aspx
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Organic Keywords: 1,919
Organic Competitors: 752
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PPC Keywords: 0
PPC Competitors: 0
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