A new book, A Social History of the South Okanagan 1920-50, by Robert and Patricia Malcolmson, is described as "A lively and colourful historical portrait of life in the South Okanagan, from Skaha Lake to Lake Osoyoos, including irrigating the arid landscape, early farm settlement, fruit-growing, rum-running, schooling, labour unions, racism, and the Osoyoos Indian Band." 

It's available for purchase from the Osoyoos Museum and the Oliver Archives.