The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life(also published asThe California & Oregon Trail) is a book written byFrancis Parkman. It was originally serialized in twenty-one installments inKnickerbocker's Magazine(1847–49) and subsequently published as a book in 1849. The book is a breezy, first-person account of a 2-month summer tour in 1846 of theU.S. statesofNebraska,Wyoming,Colorado, andKansas. Parkman was 23 at the time. The heart of the book covers the three weeks Parkman spent huntingbuffalowith a band ofOglala Sioux.