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Places
- Eklutna Dam (Alaska)1
- Europe -- Ethnic relations -- History -- 20th century1
- Europe -- Intellectual life1
- Germany -- Economic conditions -- 1918-19451
- Germany -- History -- 1933-19451
- Germany -- History -- 20th century1
- Great Lakes (North America) -- Regulation1
- New York (N.Y.) -- Religious life and customs1
- New York (N.Y.) -- Social life and customs1
- Niagara Falls (N.Y. and Ont.)1
- Niagara Falls (N.Y. and Ont.) -- Regulation1
- Russia -- History -- 1801-19171
- Saint Lawrence Seaway1
- Soviet Union -- History -- Revolution, 1917-19211
- Soviet Union -- Politics and government1
- Spain -- History -- Civil War, 1936-19391
- United States -- Emigration and immigration -- Government policy1
- United States -- Politics and government -- 20th century1