topic

• Environmental aspects19
• Petroleum chemical industry19
• Petroleum industry19
• Canyons4
• Rocks4
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name

collection

• Robert N. Dennis collection of stereoscopic views27

place

• New York (State)24
• Pennsylvania19
• Au Sable (N.Y.)4
• Au Sable River (N.Y.)4
• Monadnock, Mount (N.H.)3
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genre

• Photographs27
• Stereographs27

publisher

• Frank Robbins4

division

• Wallach Division: Photography Collection27

type

• still image27