Staple Bend Tunnel, Allegheny Portage Railroad National Historic Site, Pennsylvania
By: prepared by Sellardse Grigg, Inc
Publisher: United States Department of the Interior, National Park Service, [Denver Service Center
Published: 1991
Place of publication: Denver, Colo.]
Language: eng
Subjects: Buildings, structures; Conservation and restoration; Tunnels
Other titles: Historic structure report, architectural data section.
Notes: At head of title:  Historic structure report. Architectural Data Section.

Incudes bibliographical references (p. 15-18 (2nd group)).