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There is a page named "File:The origin of spectra (IA originofspectrathe00footrich).pdf" on Wikipedia
- sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_origin_of_spectra_(IA_originofspectrathe00footrich).pdf...(812 × 1,310 (18.5 MB)) - 02:52, 11 May 2024