The Grand Canyon National Park

The Grand Canyon National Park

4.11 - 1251 ratings - Source

I think probably currently the currently used outboard motors certainly some of them do create a disturbance. ... Thata#39;s exactly my point, that the background sound is such that it is very much a masking sound and certainly the boat noise is not any problem remote from the people who are right ... And, in fact, the Honda 4 -cycle engine that is being used by a good number of those folks right now and by theanbsp;...

Title:The Grand Canyon National Park
Author:United States. Congress. House. Committee on Resources. Subcommittee on National Parks and Public Lands
Publisher:Government Printing Office - 1998


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