Alan Powers

1991

Stephen Calloway, Elizabeth C. Cromley, Calloway, Stephen Calloway, Alan Powers

2001

Alan Powers

2016

Alan Powers

1999

Alan Powers

2003

Alan Powers

2006

Alan Powers

1989

Alan Powers

1999

Alan Powers

2008

Elain Harwood, Alan Powers

2001

Alan Powers

2006

Alan Powers

2000

Alan Powers

2010

Alan Powers, Sandra Lousada, Ioana Marinescu

2005

Alan Powers

1989

Alan Powers

2007

Alan Powers

2001

Elain Harwood, Alan Powers

2009

Alan Powers

1987

Alan Powers

1996

Alan Powers

2008

Alan Powers

2002

Alan Powers

1997

Alan Powers

1990

Alan Powers

2003

Alan Powers

Year unknown

Alan Powers

1995

Alan Powers

1999

Alan Powers

1993

Alan Powers

1992

Alan Powers