Source
Earthquake engineers inspect Dujiangyan in 1971
Source
by Covell Meyskens
https://www.youtube.com/watch?v=zLN-jRZRPrc https://www.youtube.com/watch?v=7O6-CWKOT30 https://www.youtube.com/watch?v=T58mkPyV_kU https://www.youtube.com/watch?v=x-CwaFmGVLs https://www.youtube.com/watch?v=jLY9zxF3VoQ https://www.youtube.com/watch?v=DkGpHwrKcoE https://www.youtube.com/watch?v=JUJ4_GmmDOE https://www.youtube.com/watch?v=Y3t6AU-B2oU https://www.youtube.com/watch?v=Z4tebFU9cxo https://www.youtube.com/watch?v=_7PKVGhUHeo https://www.youtube.com/watch?v=fRfptRRTR5U https://www.youtube.com/watch?v=aRgEE3Yfa7E