Replica 'Little House in the Big Woods' near Pepin, Wisconsin, on the site of the Ingalls' land and Laura's birthplace. (Photo by Sallie Ketcham.)

Charles Phillip Ingalls in his thirties. (Rose Wilder Lane Collection, Herbert Hoover Presidential Library. Courtesy of Little House Heritage Trust.)

The former Masters Hotel in Burr Oak, Iowa, now a museum. Laura lived and worked in the hotel with her parents after their Minnesota farm was devastated by locusts. (Photo by Sallie Ketcham.)

The Iowa Braille and Sight Saving School in Vinton, Iowa. Mary Ingalls attended the school, then known as the Iowa College for the Blind, from 1881 to 1889. (Photo by Sallie Ketcham.)

The site of Almanzo and Laura Ingalls Wilder's South Dakota homestead. Nothing remains of the couple's claim shanty or farm buildings. (Photo by Sallie Ketcham.)

Photo taken of Almanzo and Laura Ingalls Wilder during their disappointing sojourn in Westville, Florida. (Rose Wilder Lane Collection, Herbert Hoover Presidential Library. Courtesy of Little House Heritage Trust.)

Rose Wilder Lane in Europe about 1920. (Rose Wilder Lane Collection, Herbert Hoover Presidential Library. Courtesy of Little House Heritage Trust.)

Laura Ingalls Wilder in 1930, shortly before the publication of “Little House in the Big Woods.” (Rose Wilder Lane Collection, Herbert Hoover Presidential Library. Courtesy of Little House Heritage Trust.)

Almanzo and Laura Ingalls Wilder on a return visit to De Smet, South Dakota in the 1930s. (Rose Wilder Lane Collection, Herbert Hoover Presidential Library. Courtesy of Little House Heritage Trust.)