This is the 'difficult' version of the simple substitution cipher. It is worth 30 points. In addition, the first solver gets an addtional 15, second and third get an additional 10 and the fourth solver gets 5. There are also 5 bonus points for the first person to identify the significance of the plaintext (where did it come from?)

UHAAEHIU%%JBCZYVJ%ZAL'%ZA%CYIJBCZYEYWJI'%%YUC+ASCG-ABY EYHSYY%UBECZJSCYYBFJBDCY%BASCZ-YU%CUBEVGBASCZFUJBVSUBKZ %YWYBCZIJFVYU%C%JEY%ZAAC+SAFCZYIY+CYGYA+CZYEYUCZ'%ZYUE UVYYIJBY+SAFCZYCSYYCZSADHZCZY%ZAC+J+CG+YYCADC