Simple SQL Query

I have a table with odd column names. WHeneever I select the column I get a invalid column name. What can I do to get the query to work?

here it is

SELECT p.UWI "UWI",p.OIL-m3 "Oil",p.GAS-e3m3 "Gas",p.WATER-m3 "Water",p.COND-m3 "Condensate" FROM production p, well_info w WHERE w.LE=100;

thanks

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