I have this but have yet to see a photo. I know it was located next to the Overland Hotel on Center Street. A quick Google earth search and it appears the address is now part of Harrah's parking garage. A quick history provided by Al Moe. Pg. 150

https://books.google.com/books?id=ok2zw7T2S6oC&pg=PA162&lpg=PA162&dq=oak+room+casino+reno+nevada&source=bl&ots=5hj_OXf8VE&sig=VsARUpslx_F-piNJMQ_eUVq21tg&hl=en&sa=X&ved=0CEoQ6AEwAzgKahUKEwjtm6KzsNfHAhVN4IAKHbtEAcI#v=onepage&q=oak%20room%20casino%20reno%20nevada&f=false