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Cityscape of Pittburgh, looking from Mt. Washington.This photograph is found in a scrapbook documenting the survey for the Baltimore and Ohio Railroad in West Virginia and surrounding states.

1. View of Pittsburgh from Mt. Washington, Pa.

This photograph is found in a scrapbook documenting the survey for the Baltimore and Ohio Railroad in West Virginia and surrounding states.

2. Wabash Bridge, Pittsburgh, Pa.

A man walks down the sidewalk alone on the left.This photograph is found in a scrapbook documenting the survey for the Baltimore and Ohio Railroad in West Virginia and surrounding states.

3. Wood Street, Pittsburgh, Pa.

A steamboat travels down the river. The railroad bridge is pictured in the background.This photograph is found in a scrapbook documenting the survey for the Baltimore and Ohio Railroad in West Virginia and surrounding states.

4. B and O Bridge Over the Monongahela River at Glenwood, Pittsburgh, Pa.

A group of unidentified men listen to another explain the Searles Spiral during the surveying for the Baltimore and Ohio Railroad.This photograph is found in a scrapbook documenting the survey for the B. & O. Railroad in West Virginia and surrounding states.

5. Surveying Lecture on Searles Spiral in Unidentified Location

A group of unidentified men travel together on a horse-drawn vehicle.This photograph is found in a scrapbook documenting the survey for the B. & O. Railroad in West Virginia and surrounding states.

6. Surveyors Commuting to Work on Horse-Drawn Wagon