games_royal_society_of_london_philosophical_transactions_of_the_royal_society_of_london._a_1887-1895_1890_1898.01.01_-_phil.trans.rsl.srsa.mathphys_-_mcclean_f._-_comparative_photographic_spectra_of_stars_to_the_3_1a_2_magnitude_-_doi_10.1098.rsta.1898.0004.pdf
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