topic

• Railroad cuts4
• Railroad tracks3
• Railroad bridges2
• Railroad freight cars2
• Railroad locomotives2
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name

• James S. Earle & Sons22
• Pennsylvania Railroad22
• Purviance, W. T. (William T.)22

collection

• Robert N. Dennis collection of stereoscopic views22

place

• Pennsylvania22
• Horseshoe Curve National Historic Landmark (Pa.)4
• Susquehanna River3
• Altoona (Pa.)2
• Conemaugh River (Pa.)1
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genre

• Photographs22
• Stereographs22

publisher

division

• Wallach Division: Photography Collection22

type

• still image22