USGS High Resolution Orthoimage of Columbine High School, Littleton, Colorado, taken on 2002-04-01
1174458_13SDD920830 + 1174487_13SDD935830
U.S. Geological Survey (USGS) and the <a rel="nofollow" class="external text" href="https://www.drcog.org">Denver Regional Council of Govrnments</a> (DRCOG)
<a rel="nofollow" class="external free" href="https://earthexplorer.usgs.gov/">https://earthexplorer.usgs.gov/</a>