topic

• Coal3
• Geology1

name

• Geological Survey of Pennsylvania4
• Hart, Lane S4
• Lesley, J. P. (J. Peter), 1819-19034
• Stevenson, John J. (John James), 1841-19241

collection

• Maps of North America4

place

• Pennsylvania4
• Allegheny County2
• Allegheny County (Pa.)2
• Beaver County1
• Beaver County (Pa.)1
• More Less

genre

• Maps4
• Geological maps1

publisher

division

• Map Division4

type

• cartographic4