[AccessD] finding duplicate records based on two fields

I have a table with fixed assets by co and dept. I need to find the
duplicates- ie records  where co and dept are the same. Using the duplicate
wizard I can construct the query to find duplicates where the dept is the
same but I can't figure out the sql to find the records where two fields are
the same. Any help will be appreciated. Below is the sql that finds dept
duplicates TIA 
Jim Hale

SELECT [Other Assets].Dept, [Other Assets].Co, [Other Assets].State, [Other
Assets].[Fixed Assets]
FROM [Other Assets]
WHERE ((([Other Assets].Dept) In (SELECT [Dept] FROM [Other Assets] As Tmp
GROUP BY [Dept] HAVING Count(*)>1 )))
ORDER BY [Other Assets].Dept;

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