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Mine gases -- Pennsylvania -- Centralia
Type
http://bibfra.me/vocab/lite/Concept
Label
Mine gases -- Pennsylvania -- Centralia
Name
Mine gases
Focus
Mine gases
Sub focus
Pennsylvania
Centralia
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Subject of
1
The day the earth caved in, an American mining tragedy, Joan Quigley
Outgoing Resources
Focus
1
Mine gases
Sub focus
2
Pennsylvania
Centralia
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