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COPYRIGHT STATUS
Generally EPA's materials or information prepared by other government agencies can be freely copied; however private or commercial sites may be protected by copyright. Users are advised to check carefully for restrictions or copyrights before reproducing material from these sites.
ENVIRONMENTAL INFORMATION MANAGEMENT SYSTEM (EIMS)
HEDS is integrated with EIMS, the metadata repository for EPA's Office of Research and Development (ORD).
To search EIMS for metadata describing the human exposure studies found in HEDS, go to: http://oaspub.epa.gov/eims/eimsapi.search?partner=ord-heds&frm=simple.
EIMS capabilities extend beyond what is used with HEDS. For more information on using EIMS, go to: http://www.epa.gov/eims/ and look for the EIMS User's Guide or you can search for more ORD information contained in EIMS.
RELATED SOFTWARE
Liability and Endorsement
Links to Web sites outside the U.S. EPA Web site are provided only for the convenience of users. The Standards of Ethical Conduct do not permit the U.S. EPA to endorse any private sector Web site, product, or service. The U.S. EPA does not exercise any editorial control over the information users may find at these locations and is neither associated with nor responsible for the content, quality, or accuracy of these external sites, or for the content, functionality and operation of any software obtained from these sites.
An important reminder for anyone downloading files from any web site is to scan the download files for viruses after downloading and before opening.
PDF Documents
Some study documents available through HEDS are in the PDF format. To read these documents you will need Adobe Acrobat Reader, available as a free download. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.
Unzipping Software
Data set packages available through HEDS are zipped (compressed) to allow for easier and faster download. These packages can be unzipped with most zip software. Several free unzipping software packages that received good ratings from software review sites and are available for most Windows operating systems include:
The following links Exit EPA. 
RELATED EPA WEB SITES
RELATED NON-EPA WEB SITES
The links below are included because of their relevance to EPA and/or HEDS. To return to this site, simply click on the "Back" button of your Web Browser.
- NHANES - National Health and Nutrition Examination Survey
- U. S. Census Bureau