Dodger,
Try these on for size:
While not taking issue that Crazy Horse is the 5th face of the Black Hills, where Mt. Rushmore is located, it is Ben Black Elk, a Lakota Indian who is traditionally known as the "Fifth Face of Mount Rushmore" for his efforts as the "...driving force behind popularizing Mount Rushmore as a Black Hills vacation destination." In fact, an award is named after him for those efforts.
See: www.ancestorstart.com/30.html
www.roadsideamerica.com/pile/200307
As for the "Three Dollar Bill" during the 1860's many 3 dollar bills existed as issued by various local banks, however the most recent mention is in this article regarding CBS News' Dan Rather and his reporting about President Bush having 'evaded the draft' quoting an alleged bribe using three dollar bills with none other than "Former President Bill Clinton's portrait on them"
See: www.nationalreview.com/comment.conway200409141022.asp
I trust these will be helpful to your wife,
by the way, no charge, I'm Silversport's brother and it would be unethical,
besides I enjoyed the search.