1963

Updated: Sep 06, 2008 2:07pm PST

1975-1976

Updated: Jul 02, 2009 1:07pm PST

1976

Updated: Dec 08, 2006 6:14am PST

1977

Updated: Jul 02, 2009 1:05pm PST

1978

Updated: Jul 02, 2009 12:52pm PST

1991: Singapore

Singapore experiences (1991)

Updated: Mar 17, 2006 12:47am PST

1993

PT's Nature Conservancy volunteer award plaque (1994)

Updated: Sep 06, 2008 1:51pm PST

1997: Greece

Updated: Jan 27, 2009 10:44pm PST

1999

Updated: Oct 07, 2009 9:49am PST

2005: North Carolina (May-June)

Updated: Jun 19, 2009 3:37am PST

2006

Updated: Jun 19, 2009 3:42am PST