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Academic Commons
1987
to
1989
42
1990
to
1991
17
1992
to
1994
8
1995
to
1996
0
1997
to
1999
0
2000
to
2001
0
2002
to
2004
0
2005
to
2006
0
2007
to
2009
0
2010
to
2010
3