REMOVE

1. Physical
2. Physical Atlas
3. Virginia

WHAT

1. Atlas Map (3)
2. Landforms (2)
3. Geology (1)

WHERE

1. Maryland (1)
2. Pennsylvania (1)
3. U.S. North East (1)
4. United 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. 1827 (1)