REMOVE

1. Statistical
2. Nevada
3. Washington
4. Oregon
5. U.S.

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)