REMOVE

1. Physical
2. Pennsylvania

WHAT

1. Atlas Map (5)
2. Physical Atlas (3)
3. Geology (2)
4. View (2)

WHERE

1. Maryland (2)
2. United States (2)
3. Delaware (1)
4. Mid-Atlantic States (1)

WHO

1. Chapman, R.B. (2)
2. John Wiley & Sons Inc. (2)
3. McCormack, J.C. (2)
4. O'Brien, Emmett J (2)
5. Scovel, James L. (2)

WHEN

1. 1966 (2)
2. 1967 (2)
3. 1827 (1)