Question: What is the population of the area of the city where the writer of A Walk in the Woods was born?

full_context: Document 1: Travels with a Donkey in the Cévennes: Travels with a Donkey in the Cévennes (1879) is one of Robert Louis Stevenson's earliest published works and is considered a pioneering classic of outdoor literature.
Document 2: Michael Skube: Skube received a Bachelor of Arts from Louisiana State University. In 1975 he began working as a freelance journalist after having worked at the Customs Service. He began writing editorials for the "Raleigh News & Observer" in 1982 and became a book critic for the paper in 1986. In 1989 he won the Pulitzer Prize for Criticism and the American Society of News Editors Award for Distinguished Commentary. In the mid-1990s he moved to the "Atlanta Journal-Constitution", where he was a book reviewer and columnist. While there, he also wrote a regular beer column that won the James Beard Foundation Journalism Award for newspaper writing on spirits, wine and beer in 2000. He left the paper in October 2000 and joined the faculty of the Elon University School of Communications in 2002, where he is now an associate professor.
Document 3: I May Be Wrong but I Doubt It: I May Be Wrong but I Doubt It is a memoir by former American professional basketball player Charles Barkley. [This is not to be confused with the collection of columns by Pulitzer Prize and H. L. Mencken Writing Award-winning columnist Michael "Mike" Royko (September 19, 1932 – April 29, 1997), copyright 1968, Library of Congress Catalog Card No. 68–31464.] The book became a bestseller in 2002 and sold more than 125,000 copies. It reflects Barkley's own personality, experiences, and opinions. It explores a wide range of interests and discusses a variety of controversial topics. Each chapter has its own theme, and ranges from politics to lack of minority control in sports. It also recounts some of Barkley's memorable experiences during his Hall of Fame NBA career, such as his involvement with Michael Jordan as a member of the legendary U.S. Olympic gold medal winning "Dream Team."
Document 4: A Short History of Nearly Everything: A Short History of Nearly Everything by American-British author Bill Bryson is a popular science book that explains some areas of science, using easily accessible language that appeals more so to the general public than many other books dedicated to the subject. It was one of the bestselling popular science books of 2005 in the United Kingdom, selling over 300,000 copies.
Document 5: Saylorville, Iowa: Saylorville is a census-designated place (CDP) in Polk County, Iowa, United States. The population was 3,301 at the 2010 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area. The Saydel Community School District is located in this area. The unincorporated community of Marquisville is in this area.
Document 6: Des Moines metropolitan area: The Des Moines metropolitan area, officially known as the Des Moines -- West Des Moines, IA Metropolitan Statistical Area (MSA), consists of five counties in central Iowa, United States: Polk, Dallas, Warren, Madison, and Guthrie. The 2010 census population of these counties was 569,633, and the 2017 estimated population was 645,911.
Document 7: Mike Bryan: Mike Bryan played for Stanford University in 1997 and 1998, where he helped the Cardinal win back-to-back NCAA team championships. In 1998, he won the NCAA doubles title with his twin brother Bob.
Document 8: Des Moines, Iowa: Age spread: 24.8% under the age of 18, 10.6% from 18 to 24, 31.8% from 25 to 44, 20.4% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 93.8 males. For every 100 females age 18 and over, there were 90.5 males.
Document 9: Michael Bryson: Michael G. Bryson (August 22, 1942 – May 22, 2012) was a news and sports reporter and editor from Des Moines, Iowa and the elder brother of travel writer Bill Bryson. He co-authored a book "The Babe Didn't Point: And Other Stories About Iowans and Sports" with his son Michael G. Bryson Jr in 1989. He also wrote a book called "The Twenty-Four-Inch Home Run" in 1990. Bryson was an editor and associate publisher of the Sun Press Newspapers in Hawaii from 1979 to 1986. He covered the New York Mets in 1969 while a sports reporter for the Associated Press. He was a news reporter for the "Des Moines Register and Tribune" from 1970 to 1979. He attended Drake University.
Document 10: The Life and Times of the Thunderbolt Kid: The Life and Times of the Thunderbolt Kid is a 2006 memoir by best-selling travel writer Bill Bryson. The book delves into Bryson's past, telling of his youth growing up in Des Moines, Iowa, during the 1950s and early 1960s. It also reveals the backstory between himself and Stephen Katz, who appeared in "A Walk in the Woods" and "." Bryson also describes and comments on American life in the 1950s. The title of the book comes from an imaginary alter-ego Bryson invented for himself in his childhood, who has the ability to "vaporise people."
Document 11: Johnston, Iowa: Johnston is a city in Polk County, Iowa, United States. The population was 17,278 in the 2010 census, an increase of almost 100% from the 8,649 population in the 2000 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area.
Document 12: Cedar Rapids, Iowa: As of the 2010 United States Census, the city population was 126,326. The estimated population of the three - county Metropolitan Statistical Area, which includes the nearby cities of Marion and Hiawatha, was 255,452 in 2008. Cedar Rapids is an economic hub of the state, located in the core of the Interstate 380.
Document 13: The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life: The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life (also published as The California & Oregon Trail) is a book written by Francis Parkman. It was originally serialized in twenty-one installments in "Knickerbocker's Magazine" (1847–49) and subsequently published as a book in 1849. The book is a first-person account of a 2-month summer tour in 1846 of the U.S. states of Nebraska, Wyoming, Colorado, and Kansas. Parkman was 23 at the time. The heart of the book covers the three weeks Parkman spent hunting buffalo with a band of Oglala Sioux.
Document 14: A Walk in the Woods (book): A Walk in the Woods Front cover of the American paperback edition. Author Bill Bryson Illustrator David Cook Country United States Language English Subject Appalachian Trail Publisher Broadway Books Publication date 4 May 1998 Media type Hardcover Pages 274 pp (first edition) ISBN 0 - 7679 - 0251 - 3 OCLC 37903447 Dewey Decimal 917.404 / 43 21 LC Class F106. B92 1998
Document 15: Joe McLaughlin (sportswriter): McLaughlin was regularly sought out for expert commentary on television and radio, and has been cited/referenced in and edited innumerable books, magazines and articles. His work, a relative time machine of sports in Texas, has been sought after by the Southwest Special Collections Library and Museum at Texas Tech University. His stories are recognized as a Who's Who of athletes, from Olympians to World Boxing Champions, including Wilfred Benitez, Muhammad Ali, George Foreman, Termite Watkins, Dave "Ziggy" Zyglewicz, many of whom trace their rise to fame over the decades through Joe's stories.
ground_truth: 645,911
sub_queries: who wrote the book a walk in the woods Answer: Bill Bryson
Bill Bryson >> place of birth Answer: Des Moines
what is the population of the Des Moines area Answer: 645,911