The Evolution of transportation in western Pennsylvania.
[Denver, Colo.] : U.S. Dept. of the Interior, National Park Service, Denver Service Center, 
Roads / Pennsylvania /
Railroads > Railroads / Pennsylvania > Railroads / Pennsylvania / History.
Canals > Canals / Pennsylvania > Canals / Pennsylvania / History.
Trails > Trails / Pennsylvania > Trails / Pennsylvania / History.
Transportation > Transportation / Pennsylvania > Transportation / Pennsylvania / History.
Shipping list no.: 94-0250-P.
"NPS D-94"--P.  of Cover.
"Southwestern Pennsylvania Heritage Preservation Commission"--P.  of Cover.
vii, 153 p. :
ill., col. folded maps ;
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