Comment: Registration form for the U.S. Post Offices in North Dakota, 1900-1940. There are brief descriptions of all three of the murals in North Dakota Post Offices with the dimensions of each one. The Beaulaurier mural in Langdon is 12'x5' (or an aspect ratio of 2.40:1), the Ulreich mural in New Rockford is 12'x7' (1.71:1), and the Callahan mural in Rugby is 12'1.5"x4'2" (2.91:1).