Histogram of Deep Sky Object (DSO) Sizes from Messier Catalog and Starman1's Catalog - General Observing and Astronomy - Cloudy Nights
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Messier Monday: The most southerly Messier object, M7 | ScienceBlogs
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The Messier Catalog: A List of Messier Objects | StarLust
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The Messier Catalog Workbook - A Complete Guide and Workbook
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Messier object - Wikipedia
The Messier Catalog: A List of Messier Objects | StarLust
Deep-Sky Companions: The Messier Objects: O'Meara, Stephen James: 9781107018372: Amazon.com: Books
Messier Catalog - 110 Objects for Deep-Sky Astronomy
Messier Catalogue: the complete list - BBC Sky at Night Magazine
A Messier Road Trip Through the Sky | Fstoppers
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File:Messier objects equirectangular plot.svg - Wikipedia
The Messier Catalog: A List of Messier Objects | StarLust
SEDS Messier database, Indexes
