Get the book either from the gift shop of the Laura Ingalls Wilder Museum in Walnut Grove (although not yet in their online store, call them)
Or buy it on Amazon
Updated October 15, 2015: I removed the link to the Facebook page which is no longer active, checked the rest of the links and added an image of the cover.
Sarah S. Uthoff is the main force behind Trundlebed Tales striving to bring the History, Mystery, Magic and Imagination of Laura Ingalls Wilder and other greats of children’s literature and history to life for a new generation. Uthoff is a nationally known Laura Ingalls Wilder authority and has presented at five of the Wilder homesites, many conferences and numerous libraries, museums, and events around the Midwest. Attend one of her programs, schedule one yourself, watch her videos, listen to her podcast, and find her on Facebook, Twitter, Google+, LinkedIn, and Academia.edu. Professionally she is a reference librarian at Kirkwood Community College and director of the Oxford (Iowa) Public Library.