I ran the name John Mongolo thru the newspaper section of Ancestry.com. Had lots of hits.
The shop was called Palace Meat Market.
1935 newspaper ran a nice ad on May 31st with the address of 1018 B St. Sparks.
Reno Gazette 1933 December 26 page 4. Eileen Winslow and John Mongolo were married Christmas day. He owns the Palace Meat Market.
Hope that helps a bit. If you have a Family History Center in your town, go there as they usually have Ancestry.com on their computers for free. You can view and print out the articles you want.
Regards, Arline in Reno