Bureau of Public Roads (September 1955). "Butte" (Map). General Location of National System of Interstate Highways Including All Additional Routes at Urban Areas Designated in September 1955 Scale not given. Washington, DC: Government Printing Office. p. 51. OCLC 4165975.
The Bureau of Public Roads (BPR) was originally a part of the United States Department of Agriculture then the United States Department of Commerce.
The BPR is the predecessor agency to the Federal Highway Administration, a part of the United States Department of Transportation.

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