Photographic investigations of faint nebulae, by Edwin Powell Hubble 71654 [Author: Edwin Powell Hubble] [Link: https://www.gutenberg.org/7/1/6/5/71654] [Files: 71654-0.txt; 71654-h.htm] Thanks to Charlene Taylor, Bryan Ness and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/American Libraries.) Regards, Al