topic

• Railroad tracks5
• Railroad cuts4
• Railroad tunnels4
• Railroad bridges3
• Rock formations3
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name

• Pennsylvania Railroad40
• Purviance, W. T. (William T.)40
• James S. Earle & Sons22

collection

• Robert N. Dennis collection of stereoscopic views40

place

• Pennsylvania40
• Horseshoe Curve National Historic Landmark (Pa.)4
• Pittsburgh (Pa.)3
• Susquehanna River3
• Altoona (Pa.)2
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genre

• Stereographs40

publisher

division

• Wallach Division: Photography Collection40

type

• still image40