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Places
- United States -- Politics and government -- 20th century3
- Palisades Interstate Park2
- Canada -- Defenses1
- Canada -- Economic conditions1
- Canada -- Study and teaching1
- Eklutna Dam (Alaska)1
- Europe -- Defenses1
- Europe -- Economic conditions1
- Europe -- Ethnic relations -- History -- 20th century1
- Germany -- History -- 1945-19551
- Great Lakes (North America) -- Regulation1
- Niagara Falls (N.Y. and Ont.)1
- Niagara Falls (N.Y. and Ont.) -- Regulation1
- Saint Lawrence Seaway1
- United States -- Defenses1
- United States -- Economic conditions1
- United States -- Emigration and immigration -- Government policy1