J. H. Healy, W. W. Rubey, D. T. Griggs, C. B. Raleigh: The Denver Earthquakes. Science. Bd. 161, Nr. 3848, 1968, S. 1301–1310, doi:10.1126/science.161.3848.1301 (alternativer Volltextzugriff: USGS PDF 2,5 MB)
J. H. Healy, W. W. Rubey, D. T. Griggs, C. B. Raleigh: The Denver Earthquakes. Science. Bd. 161, Nr. 3848, 1968, S. 1301–1310, doi:10.1126/science.161.3848.1301 (alternativer Volltextzugriff: USGS PDF 2,5 MB)