REMOVE

1. Physical
2. Physical Atlas
3. Atlas Map
4. Virginia

WHAT

1. Landforms (2)
2. 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)