• 33 Videos, Slides, Films

• 33 Immigrants
• 32 Economic conditions
• 31 Labor
• 26 Imperialism
• 5 Indians of North America
• 4 Politics and government
• 3 Sports
• 2 Culture
• 2 Depressions
• 2 Social structure
• 2 Study and teaching
• 2 Territorial expansion
• 1 African Americans
• 1 American bison
• 1 American literature
• 1 Architecture, American
• 1 Art
• 1 Asian Americans
• 1 Automobile industry and trade
• 1 Business ethics
• 1 Civil engineering
• 1 Civil rights
• 1 Coal mines and mining

• 33 Films Media Group
• 33 Films for the Humanities & Sciences (Firm)
• 10 Public Broadcasting Service (U.S.)
• 8 FremantleMedia
• 5 Burns, Ken, 1953-
• 5 Infobase
• 3 Arts and Entertainment Network
• 2 Moyers, Bill D
• 2 Sunrise Media LLC
• 1 A&E Television Networks, LLC
• 1 Cambridge Educational (Firm)
• 1 John McLean Media
• 1 MacNeil/Lehrer Productions
• 1 NBD Television Ltd
• 1 National Geographic Television & Film
• 1 Network Ireland Television
• 1 Olympus Films
• 1 Spangler, Lynnn C
• 1 United Studios of America

• 33 English

• 1 New York (N.Y.)
• 1 Transcontinental Railroad National Back Country Byway (Utah)
• 1 West (U.S.)

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