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- ebrary, Inc252
- Project Muse177
- SpringerLink (Online service)164
- ProQuest (Firm)93
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- Wihtol de Wenden, Catherine30
- Edward Elgar Publishing, publisher26
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- Bean, Frank D.24
- Bade, Klaus J.23
- Foner, Nancy, 1945-23
- International Organization for Migration23
- Portes, Alejandro, 1944-22
- Zapata-Barrero, Ricard22
- Castles, Stephen20
- Project Muse, distributor20
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- Hollifield, James Frank, 1954-19
- LeMay, Michael C., 1941-19
- Massey, Douglas S.19