Description given at <a rel="nofollow" class="external text" href="http://www.nps.gov/parkhistory/online_books/jeff/adhit1.htm">www.nps.gov</a> site: "Bill Cosby performed at the 1991 VP Fair".
<a href="https://en.wikipedia.org/wiki/United_States_National_Park_Service" class="extiw" title="w:United States National Park Service">United States National Park Service</a>
1991
<a rel="nofollow" class="external text" href="http://www.nps.gov/parkhistory/online_books/jeff/images/fig2-36.jpg">www.nps.gov</a>