games_royal_society_of_london_proceedings_of_the_royal_society_of_london_1854-1905_1890_1897.01.01_-_proc.rsl_-_mcclean_f._-_on_comparative_photographic_spectra_of_stars_to_the_1a_2_magnitude_-_doi_10.1098.rspl.1897.0023.pdf
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