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00060.BH--Coal trestle--Reinforced concrete stringers--M.D. Ackerman--Edelman, PA (a12711ae-21f1-475a-a6b3-a0aafb4b4d0d)
Summary
00060.BH--Coal trestle--Reinforced concrete stringers--M.D. Ackerman--Edelman, PA
Keywords: coal trestle; concrete stringers; Railroad engineering and operation; (NPS Focus Subject Thesaurus)
Tags
Date
02/10/1907
Source
National Parks Gallery
Copyright info
public domain
