It's Arbor Day and Professor Teachman surprises his Community-College class with a visit from a special guest who is going to enlighten the students about the complex meaning of this wondrous holiday.
1956
1997
2002
1991
1948
2008
1954
1968
1999
2013
2014
1939
2012
1973
1962
1958
1987
1974
1955
