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Miller's Clocks Antiques Checklist
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Miller Grove, Illinois
Miller Grove, Illinois
This chapter examines the connections between the Miller Grove community of free Blacks and the Underground Railroad. Established in 1844, Miller Grove is a cluster of rural farmst...
2. Isotopic clocks
2. Isotopic clocks
About one in a trillion atoms of carbon is the radioactive isotope 14C. It is a ‘cosmogenic isotope’ produced by the interaction between atmospheric nitrogen (N) and cosmic rays. T...