There are 3 single 78rpm or 45rpm discs on the INTRO label
(Don't see these listed in the WIRZ discography)

Intro 6014
On Top Of Old Smokey
Jesse James

Intro 6022
The Eagle's Heart (Cindy Walker)
Working Kind of Man

Intro 6023
He Only Came Back to Say Goodbye
On Rosary Hill

Best wishes, Thomas.