Polymer chemistry area enclave ethnic highly metropolitan puerto rates rican segregated sub-groups thema EDItEUR::J Society and Social Sciences::JB Society and culture: general::JBF Social and ethical issues::JBFA Social discrimination and social justice thema EDItEUR::J Society and Social Sciences::JB Society and culture: general::JBS Social groups, communities and identities::JBSA Social classes thema EDItEUR::J Society and Social Sciences::JB Society and culture: general::JBS Social groups, communities and identities::JBSC Rural communities thema EDItEUR::J Society and Social Sciences::JB Society and culture: general::JBS Social groups, communities and identities::JBSD Urban communities thema EDItEUR::J Society and Social Sciences::JB Society and culture: general::JBS Social groups, communities and identities::JBSL Ethnic studies thema EDItEUR::J Society and Social Sciences::JH Sociology and anthropology::JHB Sociology thema EDItEUR::J Society and Social Sciences::JP Politics and government thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPR Regional, state and other local government thema EDItEUR::P Mathematics and Science::PN Chemistry::PNF Analytical chemistry::PNFS Spectrum analysis, spectrochemistry, mass spectrometry