(Langworthy-Chalmers, 48', 1857, IA-31-02) in Dubuque, Dubuque County, IA. US20 W. 1.0 miles from jct with US61 in Dubuque, N. on Alpine 0.3 miles to the house on the E. side of the road at 1095 W 3rd St. (6-10-01, N42° 29.727', W90° 40.762')