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|