[Immigration dilemmas].
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D003710:Demography; D019049:Developed Countries; D004641:Emigration and Immigration; D005060:Europe; D005061:Europe, Eastern; D011044:Poland; D011153:Population; D011157:Population Dynamics; D012036:Refugees; D014171:Transients and Migrants
Demographic Factors; Developed Countries; Eastern Europe; Europe; Illegal Migrants; International Migration; Migrants; Migration; Poland; Population; Population Dynamics; Refugees