Southern Colorado Coalfield strikes event
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United States House Committee on Mines and Mining investigated
Southern Colorado Coalfield strikes documented
document
“The same day, the United States House Committee on Mines and Mining opened an investigation on both the Northern and Southern Colorado Coalfield strikes...…”
source: url — Colorado Coalfield War · p.1
Southern Colorado Coalfield strikes about
Colorado structural
“structural link inferred from entity names (not a claim from any source): 'Southern Colorado Coalfield strikes' is a work/event about 'Colorado'…”