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).