Problems with character set in Export-Import database

 Hi my name is Marcello.

I have got a database oracle 8.1.7 with character set AMERICAN_AMERICA.US7ASCII.

I exported the database with:

export NLS_LANG=AMERICAN_AMERICA.US7ASCII

exp effenerg/xxxxx@aegg file=exp_effenerg.dmp FULL=y log=zexp.log

On another machine, i have got a database oracle 10.2.0.4 with AMERICAN_AMERICA.WE8MSWIN1252

I imported the 8i database in this 10g database with:

export NLS_LANG=AMERICAN_AMERICA.US7ASCII

imp system/yyyy@aegg file=exp_effenerg.dmp fromuser=effenerg touser=effenerg log=imp.log

After import, i noted that all the characters "à", "ò", "ù", "è", "ì" was importing with character "?"