| http://www.w3.org/ns/prov#value | - Later came the USGS tunnels, blasted with dynamite to dimensions of 4-foot-wide by 6-to-8-feet tall.???The Ka???u tunnel systems are an engineering feat of the 1920s,??? Cross said.In the flume???s heyday in 1947, some 6.5 million gallons of water a day rushed down the mountainside.
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