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. Berthe (1)
2. Bory de Saint-Vincent, M. … (1)
3. Chapman, R.B. (2)
4. Desmarest, Nicolas, 1725- … (1)
5. John Wiley & Sons Inc. (2)
6. McCormack, J.C. (2)
7. O'Brien, Emmett J (2)
8. Scovel, James L. (2)
9. United States Military Ac … (2)
10. United States Military Ac … (2)
11. USSR (2)
12. USSR (Union of Soviet Soc … (2)
13. Veuve Agasse (1)
14. Vincent (1)

WHEN

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