REMOVE

1. Pennsylvania
2. R.A. Campbell

WHAT

1. Atlas Map (2)
2. State Atlas (2)
3. World Atlas (2)

WHERE

1. Philadelphia (Pa.) (1)

WHO

1. Campbell, R.A. (2)
2. Mitchell, Samuel Augustus (2)
3. S.A. Mitchell, Jr. (2)
4. Walling, H. F. (2)

WHEN

1. 1870 (2)