Movie Duets for All: Piano/Conductor, Oboe: Playable on Any Two Instruments or Any Number of Instruments in Ensemble

I bought this book to use with others from the same series thinking that it would be a proper piano part which would serve as an accompaniment when using the other books. Instead I found that it was almost exactly the same as the other books in layout, the only difference being that occasionally there were octaves written. I had expected a piano part using Treble and Bass clef, and written to enhance the duets and fill it out musically.It was not made clear that this was not the case and I would not have bothered to buy this book if I had known.