// todo need optimize like in event.jsp. Add indexing or not indexing this page. Third era of the 20th Century - Lots of instrumental seismic stations, theories supported by observation (jan 1, 1980 – jan 1, 2000) (Timeline)
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Third era of the 20th Century - Lots of instrumental seismic stations, theories supported by observation (jan 1, 1980 – jan 1, 2000)

Added to timeline:

earthquake engineering timeline

Byzoda
16 Feb 2018

Date:

jan 1, 1980
jan 1, 2000
~ 20 years
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