Instead of the traditional RKO morse code sound, the film's opening theme music is played over the RKO radio tower image. Later, a title card is displayed explaining the premise of the story.
Opening credits prologue:
The early history of America is a tale of great first times. There were men who were the first to cross new prairies and new mountains, the first to find gold, silver and copper; to plow new wheat fields and build new settlements.
This is the story of another of the great American firsts-- the tale of the first men who took a keelboat up the wild and unexplored Missouri River--who poled, pulled and rowed their way from St. Louis through 2000 miles of hostile Indian country to the hills of Montana and opened a new land for the future - - The Great Northwest.
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