Thanks to Lisa Wells for calling attention to her website of the
1990 rafting trip down the BioBio River in Chile. Here's one photograph
from that site with a particularly good picture of Bob.
L-R: Lisa Wells, Bill Weller, Dan Smith, Darren DePoy, Bob.

Please check out the other pictures at "http://www.cfht.hawaii.edu/~lwells/biobio.html"