Atlas plates 69 and 70. Date of copyright registration 1867. Longitude west from Greenwich and Washington, D.C. "Colton’s Wisconsin" map (atlas plate 71) and city maps of Saint Louis and Chicago (atlas plate 68) on verso and bear copyright registration date 1855. Map shows Minnesota boundaries as of 1871 and may have been published in 1871 or later. 25 x 17 inches General Minnesota Maps