There is no shortage of material to get an aficionado started on the road. Contact the Laura Ingalls Wilder Memorial Society of De Smet, South Dakota, for material on local attractions and events and a schedule for the annual open-air pageant, held on several summer weekends (P.O. Box 344, De Smet, SD 57231-0344/605-854-3383). Walnut Grove, Minnesota, also hosts a pageant (1-800-761-1009). For more information contact the Tourist Information Center (Box 58, Walnut Grove, MN 56180/ 507-859-2358). Other sites on the Ingalls trail, including phone numbers and even suggestions for dining and lodging, can be found in The Little House Guidebook , by William Anderson, photographs by Leslie Kelly (HarperCollins, 1996). Laura Ingalls Wilder Country , by the same authors and publisher, is a large-format pictorial guide. Needless to say, the Wilder books that gave rise to all this industry are available everywhere.