Railroad freight traffic flows 1990.

APA Citation

United States. Federal Railroad Administration. (1980). Railroad freight traffic flows 1990. [Washington, D.C.?]: U.S. Dept. of Transportation, Federal Railroad Administration .

MLA Citation

United States. Federal Railroad Administration. Railroad Freight Traffic Flows 1990. [Washington, D.C.?]: U.S. Dept. of Transportation, Federal Railroad Administration , 1980.

Warning: These citations may not always be complete (especially for serials).