topic

• Environmental aspects5
• Petroleum chemical industry5
• Petroleum industry5
• Railroad bridges1

name

collection

• Robert N. Dennis collection of stereoscopic views67

place

• Johnstown (Pa.)47
• Pittsburgh (Pa.)8
• Gettysburg (Pa.)5
• New York (State)5
• More Less

genre

• Photographs67
• Stereographs67

publisher

• Webster & Albee49

division

• Wallach Division: Photography Collection67

type

• still image67