Linguistic Atlas of the Upper Midwest

The Linguistic Atlas of the Upper Midwest (LAUM) is a linguistic atlas documenting regional dialect variation in the American Upper Midwest, directed by Harold B. Allen. LAUM consists of 800 maps published in three volumes between 1973 and 1976, with each map corresponding to a surveyed linguistic item. The project studied five Midwestern states: Iowa, Nebraska, Minnesota, North Dakota, and South Dakota. It also included a small number of participants from the Canadian provinces of Manitoba, Ontario, and Saskatchewan. The atlas has been used to examine 19th-century westward migration patterns and their relationship to regional speech variation.