 (Year_Pub >= 1991)
 (Year_Pub >= 1991)
 (Year_Pub >= 1990)
 (Year_Pub >= 1990)
 (Year_Pub >= 1987)
 (Year_Pub >= 1987)
 (Year_Pub >= 1983)
 (Year_Pub >= 1983)
 (Year_Pub >= 1993)
 (Year_Pub >= 1997)
 (Year_Pub = 1986)
 (Title = '*th*') AND (Page_Start >= '12')
 (Title = 'th*') AND (Page_Start >= '12')
 (Title = 'th') AND (Page_Start >= '12')
 (Title = '*th')
 (Title = '*th')
 (Title = '*th')
 (Title = 's*')
 (Year_Pub <= 1980)
 (Ref_Mark = 'X')
