topic

• Coalfields1
• Coke1
• Mines and mineral resources1
• Oil fields1

name

• Chamber of Commerce of Pittsburgh1
• Krebs, Otto1

collection

• Maps of North America1

place

• Pennsylvania1
• Pittsburgh (Pa.)1
• Pittsburgh Region1

genre

• Maps1
• Thematic maps1

publisher

division

• Map Division1

type

• cartographic1