Find Common Value In Column For 30 Tables

Hi,

I am trying to query for a common value in a column called "file_auth_nbr" in 30 different tables. I was going to try something like this (see below) but wasn't sure if this was the most efficient, fastest, or correct, way to get what I'm looking for:

Select distinct a.file_auth_nbr from table1 as a
join table2 as b
on a.file_auth_nbr = b.file_auth_nbr
join table3 as c
on a.file_auth_nbr = c.file_auth_nbr
join table4 as d
on a.file_auth_nbr = d.file_auth_nbr
join table5 as e
on a.file_auth_nbr = e.file_auth_nbr
......etc., etc.

Any suggestions would be much appreciated,
Jeff