Astrobin: https://www.astrobin.com/jm0j9e/B/ Photoshop master file available here: https://e.pcloud.link/publink/show?code=XZBgeBZiipzDUvNC9yRE5unT8WlQybzU5fy According to Stewart Sharpless annotation, 1959 “A Catalogue of Hii Regions” U.S. Naval Observatory, 10 Sept. 1959 […
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