http://www.todayinsci.com/M/Messier_Charles/Messier_Charles.htm
http://www.astrosurf.com/re/messier1.html
Print:
Complete Dictionary of Scientific Biography. Vol. 9
http://go.galegroup.com/ps/i.do?&id=GALE%7CCX2830902928&v=2.1&u=fl_sarhs&it=r&p=GVRL&sw=w
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