Question: The John Downing Jr. House is a historic house in downtown Middleport, a village located on the banks of the Ohio River in the southeastern part of the U.S. state of Ohio, notably, his work with the young Samuel Clemens led to a literary appearance years later: writing under the name of "Mark Twain", Clemens portrayed him in which book, released in 1883, is a memoir by Mark Twain of his days as a steamboat pilot on the Mississippi River before the American Civil War, and also a travel book, recounting his trip along the Mississippi River from St. Louis to New Orleans many years after the War?

<P0-S0> The Jeremiah Wood House is a historic residence located in Sabula, Iowa, United States. <P0-S1>  The house is associated with the settlement of Sabula, and the occupation of steamboat pilot. <P0-S2>  Dr. Enoch A. Wood and his father James settled here in 1836 and platted the town the same year. <P0-S3>  It was named Sabula ten years later. <P0-S4>  Enoch's brother Jeremiah joined them in 1837, and worked in the family retail store. <P0-S5>  He became a steamboat pilot around 1852, and married his wife in 1860. <P0-S6>  He built the major part of this house six years later. <P0-S7>  The 2½-story stone house was built on the banks of the Mississippi River. <P0-S8>  It features modillions along the rooflines, ocular windows on the gable ends, and a two story porch on the main facade. <P0-S9>  The back wing may be as much as 30 years older. <P0-S10>  The house was listed on the National Register of Historic Places in 1982. <SEP> <P1-S0> Horace Ezra Bixby (May 8, 1826 - August 1, 1912) was a steamboat pilot on the Mississippi-Missouri-Ohio river system from the late 1840s until his death in 1912. <P1-S1>  Bixby is notable in his own right for his high standing in his profession, for his technical contributions to it, and for his service in the American Civil War. <P1-S2>  However, he is best known for having had as his "cub pilot" (that is, apprentice or trainee) the young man known to him as Sam Clemens, later to become famous under his pen name as American author Mark Twain. <P1-S3>  Twain's descriptions of Bixby's character and pedagogic style form a good part of his memoir "Life on the Mississippi", and it was through this medium that Bixby—much to his annoyance—became well-known beyond the circles of his family, friends and profession. <SEP> <P2-S0> The John Downing Jr. <P2-S1>  House is a historic house in downtown Middleport, a village located on the banks of the Ohio River in the southeastern part of the U.S. state of Ohio. <P2-S2>  Built in 1859, it was the home of prominent Middleport resident John B. Downing. <P2-S3>  Known to his intimates as "Major" Downing, he worked for much of his life as a pilot for riverboats on the Mississippi River. <P2-S4>  Notably, his work with the young Samuel Clemens led to a literary appearance years later: writing under the name of "Mark Twain", Clemens portrayed him in the book "Life on the Mississippi". <P2-S5>  One of his two sons, John B. Jr., was the house's namesake <SEP> <P3-S0> Life on the Mississippi (1883) is a memoir by Mark Twain of his days as a steamboat pilot on the Mississippi River before the American Civil War, and also a travel book, recounting his trip along the Mississippi River from St. Louis to New Orleans many years after the War.