| Credit: | unknown photographer |
|---|---|
| Date: | 1861.05-07 |
| Negative Size: | stereo |
| Equipment: | folding stool |
| Locations & Lines: | Baltimore & Ohio Railroad (B&O); Camp Essex (Elkridge MD); Elkridge MD; Maryland |
| Military Units: | 1st Massachusetts Light Artillery Battery; US Army |
| Structures & Establishments: | B&O Thomas Viaduct (Patapsco River MD) |
| Sources: | USAMHI – MOLLUS collection |
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