Looking for information about a cattle drive in 1919

I’m looking for information about a cattle drive carried out by the Les Sprinkle crew in May and June of 1919. According to a book by Janet Allison about William and Mary Rose Davies, Sprinkle bought 5000 cattle and herded them from Idaho to Chinook, then up the North Fork to a leased summer pasture in Canada. This was after a couple of very bad years of severe winters and drought that practically took Sprinkle out of the sheep business.

In the fall of that year the cattle came back south in blizzards. The majority of the cattle went to a cow camp that Sprinkle leased on Rocky Boy reservation....