ERS screens and periodically reviews links to external websites for inclusion in our links pages. This is done as a service to our customers. However, the inclusion of such links in no way constitutes endorsement of those sites. Commercial sites are also included as a service to our users. This does not imply a ERS endorsement of any products or services offered by these commercial websites. If you discover a "broken link" or have other comments about links to external websites, please send your comments to us. If you would like to propose a site for inclusion on our lists, please send us a note.