What century were the Leiper Canal and Duluth Ship Canal built?
Leiper Canal Early in the 19th century, the Leiper Canal built in 1828-29 during the middle of the American canal age ran about 3 mi along Crum Creek in Delaware County to its mouth in Eastern Pennsylvania's Delaware Valley carrying its owners quarried products to docks on the Delaware River tidewater until 1852.
Duluth Civic Center Historic District Duluth Civic Center Historic District is a historic district in Duluth, Minnesota that includes four buildings: the Saint Louis County Courthouse, designed by architect Daniel Burnham and built in 1908–1909; Duluth City Hall, designed by Thomas J. Shefchik built in 1928, the Federal Building designed by government architects and built in 1920, and the Saint Louis County Jail built in 1924. The center is a notable work of the City Beautiful movement The complex is listed on the National Register of Historic Places.