Introduction Study Area Helicopters Methodology Results Conclusions Suggestions References Acknowledgements Appendix 1 Appendix 2 Appendix 3 Appendix 4 Appendix 5	Appendix 3 . Sound Measurment Data taken of the Boening Vertol 107-II at Log Landing Sites of the "Cedar House" Timber Sale. For a pdf version of Appendix 3 - click here.