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mafic composition

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    Rigidity not to be relied upon in estimating the Earth's age
    O. Fisher
    American Journal of Science June 1893, s3-45 (270) 464-468; DOI: https://doi.org/10.2475/ajs.s3-45.270.464
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    Note on the change of electric conductivity observed in rock magmas of different composition on passing from liquid to solid
    Carl Barus and J. P. Iddings
    American Journal of Science September 1892, s3-44 (261) 242-249; DOI: https://doi.org/10.2475/ajs.s3-44.261.242
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    Is there a Huronian Group?
    R. D. Irving
    American Journal of Science October 1887, s3-34 (202) 249-263; DOI: https://doi.org/10.2475/ajs.s3-34.202.249

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