Conclusions drawn from the information portrayed in this website are the sole responsibility of the user. Although care has been taken to ensure that our data are up to date and accurate, they are provided "as-is" and we give no warranty, express or implied, as to the accuracy, reliability, utility or completeness of this information. Users of this system assume all responsibility and risk for use of the data and website. Most of the NAS data have undergone substantial editing and review prior to posting, but not all errors or inaccuracies may have been detected. Consequently, NAS data should be regarded as provisional as subsequent reviews may result in significant revisions to the data. Data users are cautioned to consider carefully the provisional nature of the information before using it for decisions or inclusion in scientific or technical publications and reports. Information concerning the accuracy and appropriate uses of these data may be obtained from the U.S Geological Survey (USGS). Please contact USGS to obtain information regarding original data sources.
This disclaimer applies both to individual use of the data and aggregate use of the data. It is strongly recommended that these data are directly acquired from a USGS source, and not indirectly through other sources that may have changed the data in some way. The USGS shall not be held liable for improper or incorrect use of the data retrieved from the NAS data retrieval Internet site.
We ask that any errors or problems found by the users be reported to us. USGS will make reasonable efforts to correct errors brought to its attention and may update or make changes to the documents provided by this server at any time without notice. However, USGS makes no commitment to update the information contained herein. Because the data in the central database are continually being updated, it is advisable to refresh data retrieved at least once a year after its receipt.
These data are the result of efforts by many of government and non-government participants in the field as well as USGS and various researchers and managers. All publications based on these data should acknowledge all of these efforts. If a publication is based solely on the analysis of NAS data, we suggest that you involve the NAS Program biologists with the writing and/or review of the manuscript. We would also appreciate receiving a reprint or copy of any publications or reports that make use of the NAS data.