REMOVE

1. Geology
2. Mining
3. Ordnance Map Office
4. 1898

WHAT

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

WHERE

1. Delaware (1)
2. Maryland (1)
3. Mid-Atlantic States (1)
4. New York (1)
5. Pennsylvania (1)

WHO

1. USSR (1)
2. USSR (Union of Soviet Soc … (1)

WHEN

1. 1967 (1)