History of Scholarly IR

Main

1891 - 1892
1950 - 1951
1951 - 1952
1996 - 1997
1998 - 1999
2004 - 2005
2009 - 2010

models

1957 - 1958
1969 - 1970
1972 - 1973
1975 - 1976
1979 - 1980
1990 - 1991
1993 - 1994