games_royal_society_of_london_proceedings_of_the_royal_society_of_london_1854-1905_1880_1886.01.01_-_proc.rsl_-_crookes_w._-_on_radiant_matter_spectroscopy-_note_on_the_earth_yi_-_doi_10.1098.rspl.1886.0026.pdf
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