[Edwin Powell Hubble]. Cepheids in Spiral Nebulae. Published in Popular Astronomy 33 252-255 and in Observatory 48 (1925): 139-142

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  The papers of Edwin P. Hubble include manuscripts and reprints of his articles, papers, public lectures, addresses, etc., scientific documentation for his papers, logbooks of photographic plates taken by Hubble at Mount Wilson and Palomar Observatories, diaries and biographical memoirs of his wife Grace Burke Hubble, professional, personal, and social correspondence, photographs, medals and awards, a scrapbook assembled by Grace Hubble, newspaper clippings, etc.

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