May God bless you and your...
I am a former Sylvan student. Bob was a favorite teacher. I still remember his rock hardness scale ie: Texas girls can fly and other queer things can do. It made no sense but after 40 years I still know talc, gypsum, calcite, fluorite..... He was one of the best.
Peter Smit
November 25, 2009 | Grand Rapids, MI