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Image: PHOTOCOPY OF PRE-1948 PHOTOGRAPH OF LOCOMOTIVE CROSSING VIADUCT WITH RELAY HOUSE IN BACKGROUND. Photo identified as Chemy negative no. 4257. Courtesy of the Smithsonian Institution HAER MD,14-ELK,1-18

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Description: Latrobe, Benjamin; McCartney, John; Wever, Casper; Thomas, Phillip E
Title: PHOTOCOPY OF PRE-1948 PHOTOGRAPH OF LOCOMOTIVE CROSSING VIADUCT WITH RELAY HOUSE IN BACKGROUND. Photo identified as Chemy negative no. 4257. Courtesy of the Smithsonian Institution. - Baltimore and Ohio Railroad, Thomas Viaduct, Spanning Patapsco River, Elkridge, Howard County, MD
Credit: https://www.loc.gov/pictures/item/md0802.photos.082117p
Permission: Public domainPublic domainfalsefalse This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.
Usage Terms: Public domain
License: Public domain
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