ok supreme books

would anyone know of any books on all ok supreme models. I am after history of ok supreme's between 1930 to 1939 and then I will want a workshop manual when I establish what model I have.
thankyou

Thought there was mention of one recently, but a quick search didn't find anything.
You after history, or a workshop manual for a specific model ?

P.S. A google search gives 2.3 million results - good basic coverage.