One author who is an exception to the rule that football stories are slow sellers is Wilfred McCormick. McCormick wrote both baseball and football juveniles.
The Bronc Burnett stories was his main series. This series was published from 1948 through 1967 by various publishers and reprinted by Grosset & Dunlap. Even the Grosset reprints are bought by collectors, though of course the books issued by the original publishers: Putnam, McKay and Bobbs-Merrill have the most value.