Pugh, Philip Observing the Messier Objects with a Small Telescope [eBook] - New York Springer New York 2012 - Online resource - The Patrick Moore Practical Astronomy Series . ISBN: 978-0-387-85356-7 (Print) 978-0-387-85357-4 (Online) ISSN: 1431-9756 (Print) 2197-6562 (Online) Subjects--Topical Terms: Astronomy, Observations and Techniques History of Science Popular Science in Astronomy Popular Science, generalPhysics