17 books • 4 series
Book #1: Christmas Duets Volume 1
Book #2: Christmas Duets, Volume 2
Book #4: Frontier Favorites Violin Duets in First Position and Easy-to-Play Keys
Book #4: Frontier Favorites Duets, Volume 1
Book #5: Frontier Favorites Violin Duets, Volume 2, in First Position and Easy-to-Play Keys