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- Le Bon, Gustave, 1841-193119
- Trotter, W. (Wilfred), 1872-19399
- Mitchell and Kenyon8
- Adam Matthew Digital (Firm), digitiser7
- Sighele, Scipio, 1868-19137
- Lee, Gerald Stanley, 1862-19446
- ebrary, Inc6
- Christensen, Arthur, 1875-19454
- Tarde, Gabriel de, 1843-19044
- Martin, Everett Dean, 1880-19413
- Sampson, Tony D.3
- United States. Congress. House. Committee on Homeland Security3
- Cantril, Hadley, 1906-19692
- Freifeld, Alice2
- McClelland, J. S.2
- Ramos Mejía, José María, 1849-19142
- Tayler, J. Lionel (John Lionel), 1874-19302
- Taylor & Francis2
- Adamatzky, Andrew1
- American Council of Learned Societies1