NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

mend, or endorse any proprietary product or proprietary material mentioned in this publication. No reference shall be made to the NOAA Environmental Research Laboratories, or to this publication furnished by the NOAA Envi-ronmental Research Laboratories, in any advertising or sales promotion which would indicate or imply that the NOAA Environmental Research Labora-tories approves, recommends, or endorses any proprietary product or propri-etary material mentioned herein, or which has as its purpose an intent to cause directly or indirectly the advertised product to be used or purchased because of this NOAA Environmental Research Laboratories publication. i i CONTENT