topic

• Railroad roundhouses3
• Railroad locomotives2
• Turntables (Railroads)2
• Railroad shops & yards1

name

• Pennsylvania Railroad4

collection

• Robert N. Dennis collection of stereoscopic views4

place

• Allegheny Mountains4
• Altoona (Pa.)4
• Pennsylvania4

genre

• Photographs4
• Stereographs4

publisher

• R. A. Bonine4

division

• Wallach Division: Photography Collection4

type