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This report was commissioned by GCPBA for the benefit of the private boater. John Vrymoed, author of the report, is a registered civil and geotechnical engineer in California, now retired. He is a published author on topics related to earthquake … Continue reading
So am I correct that one can use a rocket box by itself as a groover on the Grand? No insert is required?
Grand Canyon Colorado River Rapids, Camps and Features By Mile DirectoryA