Summit unit site concept study
Subtitle: Allegheny Portage Railroad National Historic Site, Pennsylvania
Contributors: United States. National Park Service
Publisher: U.S. Dept. of the Interior, National Park Service
Published: 1987
Place of publication: [Washington, D.C.?]
Language: eng
Number of pages: 34
Subjects: Historic sites -- Pennsylvania; Allegheny Portage Railroad National Historic Site (Pa.)
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