Without dictionary, AUL cannot recover rows to dmp format. But we could manually create them, first we talk about the user information stored in "AULUSR.TXT" text file, the file name must be in upper case under Linux/Unix, and contains two columns (User ID and User Name, split by ","). For examples:
0,SYS
1,PUBLIC
2,CONNECT
3,RESOURCE
4,DBA
5,SYSTEM
......
25,TEST
If you have system tablespace left, it could be generated by "unload table user$;" command.