Richmond, Michael (2004-12-28). Estimating Distances across our Galaxy. Rochester Institute of Technology. Retrieved on 2008-11-29.—See the two plots near the end of the page.
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== {{int:filedesc}} == {{Information |Description={{en|1=HR diagrams for two open clusters, showing the main sequence turn-off at different ages.}} |Source={{own}} |Author=Created by User:Worldtraveller |Date= |Permission= |other_versions=thumb|gif }} == Reference == <!-- Journal article showing the color-magnitude diagrams for M67, NGC 188 and two others. --> *{{cite web | last=Richmond | first=Michael | date=2004-12-28 | url=http://spiff.rit.e...