Summit unit site concept study
Subtitle: Allegheny Portage Railroad National Historic Site, Pennsylvania
Publisher: U.S. Department of the Interior, National Park Service
Published: 1987
Place of publication: Washington, D.C.?]
Language: eng
Subjects: Historic sites
Other titles: Allegheny Portage Railroad National Historic Site, Pennsylvania.
Notes: Shipping list no.: 88-211-P.

"December 1987"--P. [3] of cover.

"NPS D-21"--P. [3] of cover.