[Washington, D.C.?] : U.S. Dept. of the Interior, National Park Service, [1991]
Physical Details
1 volume (various pagings) : illustrations ; 28 cm
OCLC
ocn419255270, ocm25145560
Cover title: Historic structure report: Staple Bend Tunnel, Allegheny Portage Railroad National Historic Site, Pennsylvania.
"Historic structure report, architectural data section."
Shipping list no.: 91-705-P.
Includes bibliographical references.
Also available via Internet from the NPS web site. Address as of 06/29/09: http://home.nps.gov/applications/parks/alpo/ppdocuments/sbtnew.pdf ; current access is available via PURL.