what is the mailing address of diana rubens western area director of
the veterans administration in phoenix arizona

Dear Bromam, 

The mailing address is: 

3225 North Central Avenue
Phoenix , AZ 85012-2405

The telphone number: 
1-800-827-1000

You could see it in the Dept. of Veteran Affairs' Website:
<http://www.appc1.va.gov/directory/guide/facility.asp?ID=1053&divisionId=ALL&map=1>.

I hope this helped.  
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