topic

• Rock formations2
• Photographers1

name

• Pennsylvania Railroad3
• Purviance, W. T. (William T.)3

collection

• Robert N. Dennis collection of stereoscopic views3

place

• Pennsylvania3
• Horseshoe Curve National Historic Landmark (Pa.)1
• Packsaddle (Pa.)1

genre

• Photographs3
• Stereographs3

publisher

division

• Wallach Division: Photography Collection3

type

• still image3