http://tags.library.upenn.edu/bmarcell/directories PennTags Feed http://tags.library.upenn.edu/makerecord/url/32735 http://tags.library.upenn.edu/makerecord/url/32735 <p>Directory of companies and business professionals<a href="http://www.jigsaw.com/"></a></p> http://tags.library.upenn.edu/makerecord/url/28022 http://tags.library.upenn.edu/makerecord/url/28022 http://tags.library.upenn.edu/makerecord/url/11005 http://tags.library.upenn.edu/makerecord/url/11005 http://tags.library.upenn.edu/makerecord/url/7483 http://tags.library.upenn.edu/makerecord/url/7483 &quot;Provides details of the organizational structures of these think tanks and research activities in which they engage, functioning as the 'soft infrastructure' for a global network of think tanks.&quot; Basic organizational information on ca. 500 institutions from 100 countires is available online. <br /> http://tags.library.upenn.edu/makerecord/url/5339 http://tags.library.upenn.edu/makerecord/url/5339 Look at the Standard Directory of Advertising Agencies (the Red Book), a print source at the Lippincott Reference Desk. Also try an industry search (NAICS 541810) in the D&amp;B Million Dollar Directory. <br />