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An Oral History Of The Space Shuttle
Challenger
Disaster
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www.popularmechanics.com/...ce-shuttle-challenger-disaster
history
us-history
challenger
concord
nh
nasa
1980s
space
science
technology
mcauliffe
shared by
Christopher Herr
on 29 Jan 16
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Border Challenges: Responding to the Global Migration Crisis - The New York Times
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learning.blogs.nytimes.com/...to-the-global-migration-crisis
geography
border
migration
immigration
government
lesson-plan
civics
history
shared by
Christopher Herr
on 19 Oct 15
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