Follow Bertha, the Seattle viaduct tunneling machine(wsdot.wa.gov)
wsdot.wa.gov
Follow Bertha, the Seattle viaduct tunneling machine
http://www.wsdot.wa.gov/Projects/Viaduct/About/FollowBertha
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http://www.wsdot.wa.gov/Projects/Viaduct/About/FollowBertha
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