Linking Excel Files in Access

I have 4 CSV files that I need to somehow link together so that I can query
the data. I could manually add the data together but would prefer that is
was linked via Access so that it can be automatically updated each month (via
Peachtree). Some of the columns in each spreadsheet are the same (G/L
Account, Amount, Date, and Description). If I could pull these 4 areas from
each spreadsheet that would be perfect. My issue is (I think) that there is
nothing unique about each line so Access cannot capture all. Access can
automatically assign a unique number but it starts at 1 for each table. Any
ideas on what to do here? Should I be thinking of a different way to do
this? Thanks in advance for your help. Scott...